The atomic species A and B have different number of protons but the same number of nucleons. On the other hand, the atomic species X and Y have the same number of protons but different number of nucleons.
Which pair is an example of isobars? Why?

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Solution

Any member of a group of atomic or nuclear species all of which have the same mass number that is the total number of protons and neutrons, is known as isobars.
Protons and neutrons i.e. the atomic mass of the element is known as nucleons.

Therefore, species A and B have different protons but the same number of nucleons. So, they are isobars.
While X and Y have the same number of protons but a different number of nucleons, so they are isotopes.

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Question 07

Two atoms are said to be isobars if ?

(a) They have same atomic number but different mass number

(b) They have same number of electrons but different number of neutrons

(d) Sum of the number of protons and neutrons is same but the number of protons is different

Nuclei with the same number of protons but a different number of neutrons are called isobars

Nuclei with the same number of neutrons but a different atomic number are called isotopes

Nuclei with the same mass number are called isotones

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