Question

What is isotopes and isobars?

Answer 1

Isotopes: The atoms which posses same atomic number (the atoms same element) but a different mass number are called Isotopes.
Ex: ₁H¹, ₁H², ₁H³
These are the isotopes of Hydrogen.
The difference in mass number is due to a different number of neutrons present in the nucleus.
Isobars: The atoms which posses different atomic number with a same mass number are called Isobars.
Ex : ₁₈Ar⁴⁰, ₂₀Ca⁴⁰