The_______ of an atom is denoted by the symbol 'A'.
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The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom.
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What has the atomic symbol A?
This is represented using a "-" sign on the atomic symbol such as Cl- (a chlorine atom with one extra electron) and O2- (a oxygen atom with two extra electrons).
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Working Out The Number of Protons, Electrons and Neutrons From the Atomic Symbol.
A Mg2+
Explanation:
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