Which among the following represent a set of isotopes? Atomic nuclei containing
I. 20 protons and 20 neutrons.
II. 21 protons and 19 neutrons.
III. 22 neutrons and 18 protons.
IV. 20 protons and 22 neutrons.
V. 21 protons and 20 neutrons.

Question

Which among the following represent a set of isotopes? Atomic nuclei containing 
I. 20 protons and 20 neutrons.
II. 21 protons and 19 neutrons.
III. 22 neutrons and 18 protons.
IV. 20 protons and 22 neutrons.
V. 21 protons and 20 neutrons.

Quizplus · Accepted Answer

Isotopes are atoms of the same element with different numbers of neutrons. Hence, options I and IV and options II and V represent isotopes as they have the same number of protons but different numbers of neutrons. Option III, however, represents different elements as the number of protons determines the identity of the element. Therefore, the correct answer is D, as it contains two sets of isotopes.

Which Among the Following Represent a Set of Isotopes? Atomic