GENERAL KNOWLEDGE

Detailed explanation-1: -Nuclei with the same number of neutrons but a different atomic number are called isotopes. Nuclei with the same mass number are called isotones.

Detailed explanation-2: -Any two or more types of atoms or nuclei with the same number of neutrons are called isotones. Chlorine-37 and potassium-39 are isotones because the nucleus of this chlorine species has 17 protons and 20 neutrons, whereas the nucleus of this potassium species has 19 protons and 20 neutrons.

Detailed explanation-3: -Isotones are nuclides that have the equal number of neutrons (N) but a different number of protons in them (Z). Boron-12 and Carbon-13 both have seven neutrons and that is why they are isotones.

Detailed explanation-4: -Nuclear species with the same number of neutrons in the nucleus but a different number of protons (which makes it a different element) are called isotones of that element.

Detailed explanation-5: -The nuclei which have an identical number of nucleons, but different numbers of protons and different numbers of neutrons are called isobars. The nuclei having identical numbers of neutrons are called isotones. Their atomic number (Z) is the same but a mass number (A) is the same.