Chemistry / Chem 0217 · Atom · ~20 seconds
Atomic Number
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The atomic number is the number of protons in an atom's nucleus, and it alone defines which element the atom is.
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Any atom with six protons is carbon, atomic number 6, no matter how many neutrons or electrons that particular atom happens to have.
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Neutron count never sets identity; atoms with the same protons but different neutrons are still the same element.