There are two naturally occurring isotopes of chlorine. 35 Cl has a mass of 34.9689 u. 37 Cl has a mass of 36.9659 u. Determine the abundance of each isotope.

Abundance for chlorine:

76.9% is 35 Cl and 23.1% is 37 Cl.

Explanation:

the average mass of one mole of chlorine is 35.453g.

Let x be the fraction of the chlorine that is number 35.

1 – x is the fraction that is number 37.

Since they have equal mass number, we equate the two expressions :

34.9689 * x + 36.9659 * (1 – x) = 34.9689 * x + 36.9659 – 36.9659 * x

34.9689 * x + 36.9659 – 36.9659 * x = 35.453

1.997 * x = 1.5359

x = 1.5359 ÷ 1.997

The decimal fraction is approximately 0.769. This means 76.9% is 35 Cl and 23.1% is 37 Cl.

c8h10 is your answerr

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.