Question

(a) define isotopes and also given examples. (b) an ion X2 contain 10 electrons and 14 neutrons which is the mass no of the element?

Answer 1

(a) Atoms of same element which have same atomic number but different mass number are called Isotopes.

EX : Tritium ,Deuterium and Hydrogen .

(b) your question has no charge so it's hard to find .

For Anion

mass number = 22

FOR cation

mass number = 26