Final answer:
Nitrogen atoms with differing numbers of neutrons, such as seven or eight, are known as isotopes of nitrogen because they have the same number of protons but different numbers of neutrons.
Step-by-step explanation:
Nitrogen atoms with different numbers of neutrons, such as seven or eight, are known as isotopes. All atoms of the same element, including nitrogen, have the same number of protons. When atoms of the same element have varying numbers of neutrons, they are called isotopes. This means that while the atomic number remains constant (the number of protons), the mass number changes (the sum of the protons plus neutrons).
So, when comparing nitrogen atoms that have seven neutrons to those that have eight neutrons, we can conclude that these are different isotopes of nitrogen. Specifically, nitrogen typically has seven protons and seven neutrons, but a common isotope has eight neutrons. Therefore, the correct answer to the question about the forms of nitrogen with different numbers of neutrons is isotopes.