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Alex Semeniuk · Answer 1 · 2019-12-13T14:47:10+0000

$_(n)^(m) A \\ \\ If\ we\ have\ an\ element\ A,\ then\ n\ is\ an\ atomic\ number, \\ \\ and\ m \ is\ a\ mass\ number.$

Atomic number shows the number of protons, and charge of the nucleus.
Mass number shows sum of the number proton and neurons in the nucleus.

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