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What makes up the atomic number?

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The atomic number is the number on the top of the box on the periodic table for each element. You must have been asking what two subatomic particles make up the atomic number. In that case it would be the proton and the electron because the neutron is so mall that chemist's usually nullify it. read more

The atomic number never changes, but the electrons can be gained or lost depending on how they are aligned around the atom. The number of neutrons plus the number of protons gives the atomic weight, but atomic number is determined by the number of protons only. read more

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