How many neutrons are present in an element with mass number 35,atomic number 17 ?

An atom has a mass number $A$ and atomic number $Z:$

How many neutrons are present in its nucleus?

An atom has mass number A and atomic number Z.

How many neutrons are present in its nucleus?

Chlorine is an element of atomic number 17. It is a mixture of two isotopes having mass number of 35 and 37.

State the number of protons, electrons and neutrons in the following isotopes: ${{}^{35}\mathrm{Cl}}_{17}$,${{}^{37}\mathrm{Cl}}_{17}$ .

(a) What is meant by (i) atomic number, and (ii) mass number, of an element? Explain with the help of an example.

(b) What is the relation between the atomic number and mass number of an element?

(c) If an element M has mass number 24 and atomic number 12, how many neutrons does its atom contain?