Certain nitrogen atoms contain seven neutrons, whereas others contain eight. Such two varieties of nitrogen have the same isotopes.
The only element that may contain seven protons was nitrogen, having the atomic number 7. Each isotope of nitrogen was represented by the given arrangement. This atom, which has eight neutrons, corresponds to nitrogen-15.
Isotopes have atoms with the same amount of protons but differing numbers of neutrons. They varies in mass, which affects their physical characteristics even when they have nearly identical chemical properties.
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