The atomic number of any atom is determined by the number of protons in the nucleus of the atom.
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Atomic number is the equivalent of the number of protons in an atomic nucleus.
atomic mass of carbon=12 atomic number of carbon=6
Atomic number is number of protons in an atom while atomic mass is the sum of protons and neutrons in an atom when you subtract you will get the number of neutrons in an atom.
Atomic number 6, atomic mass 12.
The atomic mass number of iodine is 17.8923