the number of protons
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Polyatomic number are ions made up of more than one atomic element
Atomic number is the equivalent of the number of protons in an atomic nucleus.
A mixed number is made up of a whole number and a fraction.
Weird concept, but: Atomic number of helium is 2, so its square root is √2. √2 is an irrational number so only an approximate decimal expansion can be made: √2 ≈ 1.4142
atomic mass of carbon=12 atomic number of carbon=6