Question

The atoms of same element having same atomic number, but different atomic masses are called:

• A. Isotopes
• B. Isobars
• C. Isotones
• D. Both (a) and (b)

Answer 1

The correct option is A

Isotopes

The explanation for the correct option:

A. Isotopes

1. Isotopes can be defined as the variants of chemical elements that possess the same number of protons and electrons, but a different number of neutrons.
2. Therefore, atoms of the same element having the same atomic number, but different atomic masses are called: Isotopes

The explanation of the incorrect options:

B. Isobars

Isobars are elements that have the same number of nucleons (sum of protons and neutrons). In isobar, the mass number of the elements is the same but the atomic numbers are different.

C. Isotones

Isotones are atoms that have the same neutron number but different proton numbers.

D. Both (a) and (b)

From the above explanation, option D is incorrect.

Thus, (A) is the correct option.