Isotopes : Isotopes are atoms that have same atomic number but different mass numbers. Isotopes have the same atomic number because the number of protons inside their nuclei *** the same. They have different mass numbers because they have different numbers of neutrons.
For example :- 3919K, 4019K, 4119K
Isobarsare atoms that have same mass number but different atomic numbers. Isobars have different atomic numbers because they have different numbers of protons. They have same mass numbers because they have same numbers of neutrons.
For example :-4018Ar, 4019K, 4020Ca
