Answer:
Isotopes
Explanation:
Isotopes are atoms of the same element that contain an identical number of protons, but a different number of neutrons. Despite having different numbers of neutrons, isotopes of the same element have very similar physical properties.
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Oxygen has 8 protons
8 + 7 = 15
This isoptope is O-15
Non radioactive carbon 13 has 7 protons per atom.
