Question

Define Isotopes with an example.​

Answer 1

Answer:

One or more number of species which have same number of atomic number but different mass number are called isotopes.

For example, $^{1}_{1}H, ^{2}_{1}H, ^{3}_{1}H$ are the isotopes of hydrogen.

So here, the atomic number of each of these isotopes is 1 and have different mass number, that is, 1, 2, 3.