Question

__________ are atoms that have the same mass number but different atomic numbers.

• A. Isotopes
• B. Isobars
• C. Isotones
• D. Isomers

Answer 1

The correct option is B Isobars

Isobars are atoms with the same mass number but a different atomic number. So, they are atoms of different elements but with the same number of nucleons in the nucleus.

Isotopes are atoms with the same atomic number but a different mass number. So, they are atoms of the same element with a different number of nucleons in the nucleus. Isotones are atoms with a different atomic number but with the same number of neutrons in the nucleus.

Isomers are molecules with the same molecular formula (i.e. the same number of atoms of each element), but different structural or spatial arrangements of the atoms within the molecule.