Question

Hydrogen has three isotopes: protium $\left({}^{1}H\right)$, deuterium $\left({}^{2}HorD\right)$ and tritium $\left({}^{3}HorT\right)$. They have nearly same chemical properties but different physical properties. They differ in

Answer 1

${}^{1}H,{}^{2}D$ and ${}^{3}H$ have same atomic number but their atomic masses are different.

Isotopes have same atomic number i.e., same number of protons