Which two are isotopes of one another?

Two atoms with the same atomic number, but different mass numbers (same number of protons, different number of neutrons), are called isotopes, or isotopic nuclides.

Explanation:

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Explanation:

Isotopes . An isotope is one of two or more forms of the same chemical element. Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number, but a different number of neutrons giving each elemental isotope a different atomic weight.

i think the answer is terrae but not 100 percent sure. ▓▬▬ §