What to be call the nuclides having same mass numbers?

The correct answer is Isobars

Explanation:

• Nuclides are distinct kinds of atomic nuclei, characterized by a specific number of protons and neutrons.
• When nuclides have the same mass number (A), meaning the same total number of protons and neutrons, they are called isobars.
• Isobars vary in atomic number (or the number of protons) but have the same mass number.
• Examples of a sequence of isobars will be 40S, 40Cl, 40Ar, 40K, and 40Ca.
• While all of these contain 40 nucleons, they contain varying numbers of protons and neutrons.

Other Options:

• Isotopes: These are nuclides of the same element (same number of protons) but with different numbers of neutrons, leading to different mass numbers. For example, Carbon-12 and Carbon-14 are isotopes of Carbon.
• Isotones: These are nuclides with the same number of neutrons but different numbers of protons and different mass numbers. An example is Carbon-14 and Nitrogen-15.