Question

Chlorine has an atomic number 17 in the form of isotope, one of atomic weight 35 and the other atomic weight 37. What do you understand by an isotope? Name two other elements which have isotopes.

Answer 1

The atoms of same elements having the same atomic number Z but different mass number a are called isotopes. Hydrogen have 3 isotopes protium ₁H¹, deuterium ₁H², tritium ₁H³.