Read the information about the three atoms given in the table. which of them are isotopes of each other

Choice A: atom X (20 nucleons, 10 out of which are protons) and atom Y (21 neutrons, 10 out of which are protons) are isotopes of each other.

Explanation:

Two atoms are isotopes if they contain the same number of protons but different numbers of neutrons.

The table here lists the atomic number and the mass number of each atom.

Take atom X as an example:

Repeat this process to find the proton and neutron numbers of atom Y and atom Z:

.

The atomic number of atom X is the same as that of atom Y. Their atomic number differ from that of atom Z. Their number of neutrons differ. Thus only atom X and atom Y are isotopes of each other.

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