Question

Which of the following sets represents a pair of isotopes? 14C and 14N 206Pb and 208Pb O2 and O3 32S and 32S2-

Answer 1

The isotopes are 206Pb and 208Pb, which are both isotopes of lead but with different numbers of neutrons, 124 and 126 respectively.

Step-by-step explanation:

The pair that represents a set of isotopes is 206Pb and 208Pb. Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. In this pair, both isotopes belong to lead (Pb) which has an atomic number of 82, indicating that each isotope has 82 protons. 206Pb has 124 neutrons while 208Pb has 126 neutrons. The difference in neutron number gives us these two different isotopes of lead.

Answer 2

Isotopes are substances that have the same number of protons but differ in the number of neutrons. Hence, the pair of isotopes above should be of the same element. In the given choices, 14C is not an isotope of 14N. 206Pb is an isotope of 208 Pb. O2 and O3 differ in molecular formula but still made up of same kind of atom, hence they are allotropes, while 32S and 32S2- are not isotopes.