The atomic number is equal to the number of the protons in the
atomic nucleus.
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Oxygen is a gas. atomic number of it is 8.
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Atomic number is the number of protons in an atom. If the atomic
number is 54, then there are 54 protons. If it is a neutral atom,
it will also have 54 electrons.
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The isotope carbon 14:
Atomic number = number of protons = number of electrons = 6