Which of the following pairs of atoms, specified in terms of subatomic particle composition, are isotopes?
A) (24p, 24e, 24n) and (25p, 25e, 25n)
B) (24p, 24e, 24n) and (24p, 24e, 28n)
C) (24p, 24e, 28n) and (25p, 25e, 28n)
D) more than one correct response
E) no correct response

Question

Quizplus · Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons. Pair A and C have different numbers of protons and pair B has the same number of protons (24) but a different number of neutrons (24 in the first atom and 28 in the second atom). Therefore, pair B is the only pair that represents isotopes.

Which of the Following Pairs of Atoms, Specified in Terms