Which of the following are pair of isotopesSelect answersA6C13, 6C14B6C14, 7N14C6C13, 7N14D7N14, 7N15

Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number. All isotopes of a given element have the same number of protons but different numbers of neutrons in each atom.

The notation used in the question is the atomic symbol (C for carbon, N for nitrogen) followed by the atomic number (the number of protons, which defines the element) and the mass number (the total number of protons and neutrons).

A. 6C13 and 6C14: These are isotopes of carbon (C), as they have the same number of protons (6), but different numbers of neutrons (7 and 8, respectively).

B. 6C14 and 7N14: These are not isotopes. They are different elements (carbon and nitrogen) and have different numbers of protons (6 and 7, respectively).

C. 6C13 and 7N14: These are not isotopes. They are different elements (carbon and nitrogen) and have different numbers of protons (6 and 7, respectively).

D. 7N14 and 7N15: These are isotopes of nitrogen (N), as they have the same number of protons (7), but different numbers of neutrons (7 and 8, respectively).

So, the pairs of isotopes are A (6C13 and 6C14) and D (7N14 and 7N15).