Question

which among these are isotopic pairs?​

Answer 1

Isotopes are the chemical species which have the same atomic number but different mass numbers. In the given atoms, atom P and R have the same atomic number but different mass numbers. Hence atoms P and R makes an isotopic pair

Answer 2

Explanation:

Isotopes are the chemical species which have the same atomic number but different mass numbers.

In the given atoms, atom P and R have the same atomic number but different mass numbers.

Hence atoms P and R makes an isotopic pair.