Atoms having the same mass number but different atomic numbers are known as-

Correct option is A

The correct answer is (a) Isobars.
· Isobars are atoms of different elements that have the same mass number but different atomic numbers. This mea
· ns they have the same total number of nucleons (protons and neutrons) but differ in the number of protons and neutrons individually.
Information Booster:
· Isotones: Atoms with the same number of neutrons but different atomic numbers.
· Isotopes: Atoms of the same element with the same atomic number but different mass numbers (different numbers of neutrons).
· Nucleons: The collective term for protons and neutrons within the nucleus, but not a classification of atoms.