Why does the size of an atom decrease as you move from left to right across a period on the periodic table?

There are 0.075 moles of CO2 are present in 4.5 x 1022 molecules/atoms of co2

Mole is stated as the quantity of a material that consists 6.022 X 1023 entities of the supplied substance, such as particle, atoms, ion, molecules, etc. The quantity of atom, ions, or molecules is measured in moles.

One mole of a substance is defined as having Avogadro's number of entities (atoms, molecules, ions, etc.). Avogadro's number is defined as 6.022 x 10^23 entities per mole.

So, to convert from the number of entities to the number of moles, divide the number of entities by Avogadro's number:

4.5 x 10^22 entities / 6.022 x 10^23 entities/mol = 0.075 moles

Therefore, 4.5 x 10^22 CO2 molecules/atoms is equivalent to 0.075 moles of CO2.

To know more about mole visit :

https://brainly.com/question/26416088

#SPJ4

The chemical name is CHCl3. It is a common, thick, colorless liquid with a pleasant fragrance.

Chloroform may be released into the air as a result of its production during the chlorination of drinking water, wastewater, and swimming pools. Chloroform, a substance used in industry, is a lacrimator.

From CH4 + 3 Cl2 comes CHCl3 + 3 HCl.

One molecule of CHCl3 and three molecules of HCl were produced when three molecules of Cl and one molecule of CH4 were mixed.

This predicts a 1:1 ratio between CH4 and CHCl3.

Due to the 1:1 ratio, the amount of CHCl3 produced is 66.5/119.5 (molar mass of CHCl3), or 0.556 moles, and the amount of CH4 produced is 0.556 moles mass, or 0.556 x 16 (molar mass of CH4), which equals 8.896 grams.

To know more about chloroform

https://brainly.com/question/13334667

#SPJ4

The stated statement states that 398 mg of Krypton contains 4.75 x 10-3 moles of Kr.

Krypton (Kr) is a naturally occurring element that is a rare gas belonging to Periodic Table Group 18 (noble gases). It only forms a small number of chemical compounds. Krypton is monoatomic, tasteless, colorless, and about 3.5 times heavier than air.

Krypton is categorized as a chemistry element and then a nonmetal in the chemical world. William Gordon and his helper Morris Travers found it in 1898.

The molar mass of Kr is 83.80 g/mol.

So, moles = 398 mg / 1000 mg/g / 83.80 g/mol = 4.75 x [tex]10^{-3}[/tex] moles Kr

So, the answer is a. 4.75 x [tex]10^{-3}[/tex] moles Kr.

To know more about Krypton visit:

https://brainly.com/question/2364337

#SPJ4

a molecule has two bonded atoms around the central atom. the central atom does not have any lone pairs.  The molecule has a linear geometry.

A molecule with two bonded atoms around the central atom and no lone pairs on the central atom has a linear geometry. This is because the repulsion between the two bond pairs is equal in magnitude and opposite in direction, leading to a 180 degree bond angle between the bonds. The bond angles in a linear molecule are always 180 degrees and the molecule has a straight line shape is observed in many molecules, such as CO2 and N2, and is also observed in some diatomic (two-atom) molecules, such as H2 and Cl2.

Learn more about linear geometry here:

https://brainly.com/question/16178099

#SPJ4

According to Beer-Lambert law, absorbance will also decrease by 42.4%

In chemistry, awareness is the abundance of a constituent divided by using the whole extent of an aggregate. several styles of mathematical description can be outstanding: mass concentration, molar awareness, quantity concentration, and volume awareness.

In technology, the amount of a substance, which includes salt, this is in a positive amount of tissue or liquid, along with blood. A substance becomes more concentrated while much less water is present. The concentration of the solution may be expressed in molarity, molality, normality, mole fraction, and many others. the attention of a substance is the amount of solute present in a given quantity of answer. Concentrations are commonly expressed in phrases of molarity, defined as the variety of moles of solute in 1 L of answer.

To learn more about Concentration visit here:

brainly.com/question/10725862

#SPJ4

Consequently, the gas's new volume will be 2.5 L. 40 atm of pressure is increased,

if the pressure is reduced to 40 atm.

The relationship between pressure, volume, and temperature is described by the Ideal Gas Law,

which states that PV = nRT,

where P is pressure,

V is volume,

n is the number of moles of gas,

R is the gas constant, and

T is temperature.

To determine the new volume, you would need to know the values of n, R, and T, in addition to the new pressure.

The gas's starting pressure is P1 = 10 atm

The gas's ultimate pressure, P2, is 40 atm.

The gas's initial volume, V1, is equal to 10 L.

Replace the volume and pressure numbers in equation (1);

(40 atm) V2 = (10 atm) (10 L)

V₂ = 100/4

V₂ = 2.5 L

For such more question on Ideal Gas Law

https://brainly.com/question/27870704

#SPJ4

The vapor pressure will be 5.00 times higher than it was at 293 k at 393 k.

The Clausius Clapeyron equation calculates the relationship between a substance's vapor pressure (P) and temperature to forecast the rate at which vapor pressure rises per unit increase in temperature (T).

A phase change from the liquid phase to the vapor phase is called vaporization of an element or molecule. Both evaporation and boiling result in vaporization.

To find the temperature at which the vapor pressure will be 5.00 times higher than it was at 293 K, we can rearrange the equation to solve for T: We know,

 [tex]T = \frac{del H}{(R * ln\frac{P_2}{P_1} )} + 293[/tex]

where P₁ is the vapor pressure at 293 K and P₂ is the vapor pressure at the desired temperature. Plugging in the values, we get:

[tex]T = \frac{49.21}{8.314*ln(5)} +293[/tex]

Solving for T, we get a temperature of approximately 393 K

Learn more about vaporization

brainly.com/question/24096079

#SPJ4

The number of valence electrons, the electrons found in the outer electron shell of the atom, determines whether or not an atom reactive.

Reactivity is the property of an atom in which it is either likely or unlikely to form a bond with another atom to create a molecule. The three types of bonds are ionic, covalent, and metallic. The Atoms seek to fill their valence shell with eight electrons but not all atoms will have enough electrons to achieve that goal. If an atom has less than eight valence electrons it is more likely to bond with other atoms to share electrons and artificially fill the valence shell of both atoms. The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell. Elements in the periodic table whose outermost shells are filled with electrons (8). Helium, neon, and argon are examples of noble gas elements. They are very non-reactive. The atoms are most stable, least reactive, when their outermost electron shell is full. Most of the elements important in biology need eight electrons in their outermost shell in order to be stable, and this rule of thumb is known as the octet rule.  

Link more about atom reactive here:

https://brainly.com/question/13518322

#SPJ4

Answer:

Explanation:

The difference in the physical state of LiCl and NCl3 at room temperature is due to the difference in their intermolecular attractive forces.

LiCl has strong ionic bonds, which are strong attractive forces between positive and negative ions. These strong attractive forces result in a high melting and boiling point, making LiCl a solid at room temperature.

NCl3, on the other hand, has weaker covalent bonds, which are attractive forces between atoms in a molecule. These weaker attractive forces result in a lower melting and boiling point, making NCl3 a liquid with a relatively low boiling point at room temperature.

The strength of intermolecular forces is determined by the type of bond and the molecular structure. Ionic bonds are stronger than covalent bonds, and the stronger the bond, the higher the melting and boiling points of a substance.

Answer:

56.26%

Explanation:

The theoretical mass percent of barium in BaCl2 . 2H2O can be calculated as follows:

First, find the molar mass of BaCl2 . 2H2O:

BaCl2 . 2H2O = Ba + 2Cl + 2(H2O)

= 137.327 + 2 x 35.45 + 2 x 18.015

= 244.297 g/mol

Next, find the mass of barium in one mole of BaCl2 . 2H2O:

Ba = 137.327 g

Finally, divide the mass of barium by the total mass and multiply by 100:

(137.327 g / 244.297 g) x 100% = 56.26%

So, the theoretical mass percent of barium in BaCl2 . 2H2O is 56.26%.

we get T1*V1γ-1 = T2*V2γ-1, which gives T2/T1 = 2γ-1 = 1.25, which gives T2 = 1.25*T1, therefore temperature increases by a factor of 1.25

The ratio of a gas's specific heat at a constant pressure to that of the gas's specific heat at a constant volume is known as the specific heat ratio of a gas, which is symbolized as gamma " but also known as "k."

Calculation-

in an adiabatic process

PVγ = constant

therefore      P1*V1γ  = P2*V2γ  

here we have in part a    that    V2 = 0.5*V1   and  P2 = 2.5*P1

putting in the values   we get, 2γ = 2.5 which on solving we get

γ = 1.3219

now part b, we can use                  

TVγ-1 = constant, therefore here we have

T1 = initial temperature, T2 = final temperature

and V2 = 0.5*V1

on putting in the values we get,

T1*V1γ-1 = T2*V2γ-1

which gives  

T2/T1 = 2γ-1 = 1.25      which gives    T2 = 1.25*T1

therefore,

temperature increases by a factor of 1.25

To know more about specific heat visit:

https://brainly.com/question/11297584

#SPJ4

When a solution with a nonvolatile solute is prepared, the freezing point and boiling point of the solution will decrease relative to the pure solvent.

When a solution is prepared by dissolving a nonvolatile solute in a solvent, the presence of the solute particles in the solvent affects the behavior of the solution as compared to the pure solvent. The solute particles interfere with the normal packing of solvent molecules, which leads to a decrease in the intermolecular forces between solvent molecules. As a result, the solution requires less energy to freeze or boil compared to the pure solvent. This is why the freezing point and boiling point of the solution are lower than that of the pure solvent. The decrease in the freezing and boiling points is proportional to the concentration of solute particles in the solution. On the other hand, the vapor pressure of the solution is not greatly affected by the presence of the solute, as the solute particles do not evaporate with the solvent.

To know more about the boiling point of pure solvent, visit:https://brainly.com/question/1408304

#SPJ4

The molality of a solution of water dissolved in ethanol is 0.0273 for which the mole fraction of water is 0.492.

Given the mole fraction of water (x_water) in the solution of water and ethanol, the molality (m) can be calculated as follows:

= m

= (x_water) / (MW_water)

where MW_water is the molecular weight of water (18.015 g/mol).

= m

= (0.492) / (18.015 g/mol)

= 0.0273 mol/kg

Therefore, the molality of the solution of water and ethanol is 0.0273 mol/kg.

To know more about molality please refer: https://brainly.com/question/26921570

#SPJ4

It is important to allow a sterilized inoculating loop to cool before attempting to sample liquid culture because it avoids killing of microorganisms.

It is important to cool the inoculating loop prior to obtaining a bacterial sample because the high heat in loop could kill the bacteria once they touch our loop. Bacteria might be versatile in nature, but they cannot handle a 400 degree hot metal loop.

We must allow our loop or needle to cool before our try to pick up our organism. If we pick up organism with a hot tool, oour cells will be killed. To cool our loop or needle quickly, place it on a section of agar that is uninoculated or is at least different from the area from which we will pull cells.

Learn more about sterilized inoculating loop from the link given below.

https://brainly.com/question/30425703

#SPJ4

The building blocks of life are known as organic molecules, which are found in all living organisms and contain both carbon and hydrogen.

Living creatures possess organic molecules that are composed of both carbon and hydrogen. Organic molecules are the basis of life and are essential for many biological functions, including energy storage, communication, and structural support. Carbohydrates, lipids, nucleic acids, and proteins are some examples of organic compounds.These molecules include proteins, lipids, nucleic acids, and carbohydrates.

Sugars like glucose and fructose are examples of carbohydrates, which give cells energy. Various compounds known as lipids are used as insulation and energy storage. DNA and RNA are two examples of nucleic acids that store and convey genetic information.

To know more about organic molecules, visit:

https://brainly.com/question/10504103

#SPJ4

The atoms of cesium (Cs) have the largest atomic radius on the periodic table.

Cesium has the chemical symbol Cs and the atomic number 55. It's a soft, silvery-gold alkali metal with a melting point of twenty-eight point five degrees Celsius (83.3 degrees Fahrenheit), making it one of only five elemental metals that's liquid at or near room temperature. Cesium shares physical and chemical properties with rubidium and potassium. Cesium is found in the Earth's crust at a concentration of about 3 parts per million on average. It's most commonly found in atomic clocks, photoelectric cells, and medical treatments.

A photoelectric cell is a type of photodetector in which light energy is converted into electrical energy. It is made of a semiconductor material that, when exposed to light, emits electrons. It is used in a variety of applications, including security systems, cameras, and solar cells. Photoelectric cells were one of the first forms of renewable energy, and they can be found in a variety of applications such as solar cells, security systems, and cameras. They're also used in industrial settings to control motors, automatic door openers, and traffic lights.

To  know more about  Cesium:

brainly.com/question/24316293

#SPJ4

The cube-shaped crystals of halite are due to the arrangement of atoms in the crystal lattice.

Halite is a type of salt with a simple cubic crystal structure, where the sodium and chloride ions are arranged in a repeating pattern in three dimensions. This arrangement gives rise to the cube-shaped crystals that are characteristic of halite.

The cube-shaped crystals of halite are due to the arrangement of atoms in the mineral's crystal lattice. Halite is a type of salt that has a simple cubic crystal structure, where sodium and chloride ions are arranged in a repeating pattern in three dimensions. The repeating pattern of ions in the crystal lattice gives rise to the cube shape of the crystals. The crystal shape is not related to the fact that halite is soluble in water or to the way two tetrahedron can join. Instead, the cube shape is a result of the arrangement of the atoms in the crystal lattice.

Learn more about halite here:

https://brainly.com/question/20064767

#SPJ4

The pH of a solution prepared by the addition of 10 ml of 0.002 M KOH (aq) to 10 ml of distilled water is closest to 13.

The addition of 10 ml of 0.002 M KOH to 10 ml of distilled water results in a final concentration of 0.002 M KOH in the solution. This concentration of KOH will result in a high hydroxide ion concentration, which will make the solution basic with a pH greater than 7.

The pH of a solution is a measure of its acidity or basicity and is defined as the negative logarithm of the hydrogen ion concentration. A pH of 7 is neutral, a pH less than 7 is acidic, and a pH greater than 7 is basic.

The pH of the solution can  be calculated using the equation:

pH = -log[OH-]

Since the concentration of hydroxide ions, [OH-], is equal to the concentration of KOH, 0.002 M, the pH of the solution is:

pH = -log(0.002) = 2 + log(10^3) = 2 + 3 = 5

Therefore, the pH of the solution is closest to 13.

Learn more about pH here :

https://brainly.com/question/15289741

#SPJ4

pH of diluted solution = 11

It is given that 10 mL of a 0.002 M KOH(aq) solution is diluted by adding 10 mL of distilled water. We are required to then calculate the pH of the diluted solution.

To solve this question, we can break it up into 3 sections:

pH, short for 'potential of hydrogen' is a scale used to measure the acidity of substances, where 0 is most acidic, and 14 is least acidic. pH is calculated with the formula:

[tex]\boxed{\large\textsf{$\sf pH=-\log_{10}\left[H^+\right]$, where $\rm \left[H^+\right]$ = concentration of H$^+$ ions}}[/tex]

Similarly, pOH is used to measure the basicity of substances, where 0 is the most basic, and 14 is the least basic. pOH is calculated with the formula:

[tex]\boxed{\large\textsf{$\sf pH=-\log_{10}\left[OH^-\right]$, where $\rm \left[OH^-\right]$ = concentration of OH$^-$ ions}}[/tex]

The mathematical relationship between pH and pOH is such that:

[tex]\boxed{\Large\textsf{14 = pH + pOH}}[/tex]

First we need to calculate the concentration of the diluted solution. To do this, we can use the dilution formula, c₁V₁ = c₂V₂, where the subscripts 1 and 2 denote initial and final respectively.

Hence, c₁ = 0.002 M, V₁ = 0.010 L, and V₂ = 0.010+0.010=0.020 L. Rearranging to find c₂:

[tex]\large\textsf{$\sf\displaystyle c_2=\frac{c_1V_1}{V_2}=\frac{0.002\times 0.010}{0.020}$}\\\\\boxed{\boxed{\large\textsf{$\sf\displaystyle\therefore concentration\ of\ diluted\ solution=0.001$ M }}}[/tex]

If we consider the dissociation reaction of KOH, which is a strong base and will fully dissociate into its ions:

[tex]\Large\text{$\rm KOH_{\,(aq)}\leftrightharpoons K^+_{\ (aq)}+OH^-_{\ (aq)}$}[/tex]

We can see that there is a 1:1 stoichiometric ratio between KOH and OH⁻ and therefore concentration of KOH = concentration of OH⁻.

Therefore, we can calculate pOH:

[tex]\boxed{\boxed{\large\textsf{$\sf\therefore pOH=-\log_{10}\left[0.001\right]=3$}}}[/tex]

Finally, we can use the fact that pH + pOH = 14 and so pH = 14 - pOH.

Therefore, pH = 11

[tex]\hrulefill[/tex]

https://brainly.com/question/36153729

Answer:

The reason he painted soup cans is that he liked soup." He was thought to have focused on them because they composed a daily dietary staple. Others observed that Warhol merely painted things he held close at heart. He enjoyed eating Campbell's soup, had a taste for Coca-Cola, loved money, and admired movie stars.

The density of the iron is 7.87 g/cm3 when 5.2 g of iron to 20.50 ml of water and volume is 21.16 ml.

Given data in the question is:

Mass of iron is 5.2 g.

Water is 20.50 ml.

Combined volume of iron and water is 21.16 ml.

The density of the iron is Mass/Volume.

Final volume of water = 21.16 - 20.50 = 0.66 ml

Density = 5.2 / 0.66 = 7.87 g/cm3.

Density is a measure of mass per unit volume. It is an intensive property, meaning that its value does not change depending on the size of the object.

Density Meaning in Physics: In physics, density is the ratio of the mass of an object to its volume. It is often defined as mass per unit volume.

Learn more about density:

brainly.com/question/29775886

#SPJ4

The frequency and the wavelength are;

1)  4 * 10^-5 m

2) 2 * 10^-7 m

3) 4.4 * 10^13 Hz

4)  4.6 * 10^14 Hz

5)  4.5 * 10^-7 m

From the fact that;

c = λf

c = Speed of light

λ = wavelength

f = frequency

1)  λ = 3 * 10^8/7.5 * 10^12

λ = 4 * 10^-5 m

2)  λ = 3 * 10^8/1.5 * 10^15

λ = 2 * 10^-7 m

3) f = c/ λ

f = 3 * 10^8/6.8 * 10^-5

f = 4.4 * 10^13 Hz

4) f = 3 * 10^8/6.5 * 10^-7

f = 4.6 * 10^14 Hz

5)  λ = c/f

= 3 * 10^8/6.6 * 10^14

= 4.5 * 10^-7 m

Learn more about wavelength:https://brainly.com/question/13533093

#SPJ1

Burning a steel wheel, a candle, some sulfur, or a splinter produces new chemicals which is an observable evidence that suggests combustion is a chemical transformation.

The five elements of chemical change are: color change, precipitate or gas production, gas formation, odor change, and temperature change. A chemical reaction in which both light and heat can be seen is the burning of wood. We refer to a reaction as being exothermic when it produces heat. In other words, heat is transmitted from the reactants to the environment outside. When a chemical interacts with oxygen to release energy, a combustion event will always take place. For instance, methane burns in oxygen and produces carbon dioxide and water as byproducts. The oxidation of the carbon in the methane is demonstrated by the production of carbon dioxide. Also, burning of substance results in the release of heat and light energy, which is a sign of chemical change.

To learn more about combustion click here https://brainly.com/question/14177748

#SPJ4

Minerals are inorganic substance, structurally simple substances free of carbon atoms.

All substances that are not organic and do not have a carbon-to-carbon (C-C) or carbon-to-hydrogen (C-H) bond are considered inorganic substances. Aqua, table salt (NaCl), sodium bicarbonate, calcium carbonate, and muriatic acid are some examples of typical everyday inorganic compounds (industrial-grade hydrochloric acid).

Compounds classified as organic are those derived either indirectly or directly from animals and plants. Inorganic compounds are those compound which are made from minerals. Many times, simple carbon compounds are regarded as inorganic. Examples include carbon monoxide, carbon dioxide, carbides, and the many forms of carbon (such as graphite, diamond, buckminsterfullerene, etc.).

To know more about inorganic substance visit :

https://brainly.com/question/11527440

#SPJ4

It is true that under conditions of normal pressure and temperature, we can only make perfect calculations.

STP, or average temperature and humidity, refers to the conventional air temp at sea level. The temperature and pressure are, respectively, 0 °C and 1 atm.

It is now easier to compare different measurements for gases, such as the quantity of gas molecules in a given volume. There has to be a universal standard for pressure and temperature so that scientists may meaningfully compare various sets of data.

To know more about temperature visit :

https://brainly.com/question/29998308

#SPJ4

The density of the liquid is: 0.7883 g/ml

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

The formula and the procedure we will use is:

d = m/v

Where:

Information about the problem:

Applying the density formula we get:

d = m /v

d = 7.883 g /10.0 ml

d = 0.7883 g/ml

Learn more about density in: brainly.com/question/1354972

#SPJ4

To calculate the actual yield of magnesium nitrate, you need to know the theoretical yield and then compare it to the actual yield. The theoretical yield is calculated based on the balanced chemical equation for the reaction between magnesium and copper(ii) nitrate. The actual yield is the amount of magnesium nitrate that was actually produced during the reaction.

Magnesium nitrate refers to the inorganic compound with the formula Mg(NO₃)₂ₓ, where x = 6, 2, and 0. These are all white solids. The anhydrous material is hygroscopic, quickly forming hexahydrate when in air. All salts are highly soluble in water and ethanol.

Learn More About Magnesium Nitrate at https://brainly.com/question/20461056

#SPJ4

40.0 grams of a solute is dissolved in 500 milliliters of a solvent with a density of 1.00 g/ml to produce a solution with a volume of 495 ml.  The concentration of the solution is 0.08081 g/ml

In this solution, 40.0 grams of a solute is dissolved in 500 milliliters of a solvent with a density of 1.00 g/ml to produce a solution with a volume of 495 ml. The concentration of the solution can be calculated by dividing the mass of the solute (40.0 g) by the volume of the solution (495 ml). The result of this calculation is 0.08081 g/ml, which represents the concentration of the solution. This means that in every milliliter of the solution, there are 0.08081 grams of the solute. It's important to note that the concentration of a solution is an expression of how much solute is present in a given volume of the solvent and is usually expressed in units of grams per milliliter (g/ml) or moles per liter (M).

To know more about the concentration of a solution, visit:https://brainly.com/question/14077874

#SPJ4

The boiling point of the solution made by dissolving 9.70 g of naphthalene in 90.7 g of benzene is 139.3 °C.

The boiling point of a solution is elevated compared to the boiling point of the pure solvent, due to the presence of solute particles in the solution. The boiling point elevation can be calculated using the following equation:

ΔT = Kb x molality

where ΔT is the change in boiling point, Kb is the boiling point elevation constant, and molality (m) is the concentration of the solute expressed in mol/kg.

To use this equation, we first need to find the molality of the naphthalene in the solution. To do this, we need to find the number of moles of naphthalene in the 9.70 g sample:

9.70 g naphthalene / 128.17 g/mol

=> 0.0758 mol naphthalene

Next, we need to find the mass of the solvent in the solution, which is 90.7 g. The molality of the naphthalene can then be calculated as follows:

molality = moles solute / mass of solvent (in kg)

=> 0.0758 mol / (90.7 g / 1000 g/kg)

=> 0.0837 mol/kg

Now that we have the molality, we can calculate the boiling point elevation:

ΔT = Kb x molality

=> 2.53 K/m x 0.0837 mol/kg

=> 0.2111 K

Finally, we can use the boiling point elevation to find the boiling point of the solution:

Boiling point of solution = boiling point of solvent + ΔT

=> 80.1 °C + (0.2111 K x 273.15)

=> 80.1 + 59.18

=> 139.3 °C

To learn more about Boiling point :

https://brainly.com/question/14681555

#SPJ4

The ionization energy decreases within a group. The energy of ionization rises over time.

Patterns in the elements of the periodic table are called periodic trends. Electronegativity, ionization energy, electron affinity, atomic radius, and metallic character are the most important trends.

The following are major periodic trends: electronegativity, the energy of ionization, electron affinity, the atomic radius, the melting point, and the metallic nature of the substance. The arrangement of the periodic table gives chemists a useful tool for quickly predicting an element's properties: periodic trends.

To know more about ionization energy visit :-

https://brainly.com/question/28385102

#SPJ4

The atomic number for an element with a mass number of 152 and 90 neutrons per atom is 62, which corresponds to the element samarium.

What is samarium element?

Samarium is a silvery-white metal that is highly reactive, but it has no known biological role. It is found in small amounts in the Earth's crust and is mainly used in certain types of magnets and in certain types of nuclear reactors.

Calculation of atomic number:

The atomic number is the number of protons in the nucleus of an atom and is equal to the number of electrons in a neutral atom. Since the mass number is the sum of protons and neutrons in an atom, and the number of neutrons in this atom is 90, the number of protons must be [tex]152 - 90 = 62[/tex].

To know more about atomic number calculation, check out:

https://brainly.com/question/28826089

#SPJ4