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. In the symbol (4/2) He, the superscript 4 is the _________________ for helium, and the subscript 2 is the ___________________ for helium.
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. In the symbol (4/2) He, the superscript 4 is the _________________ for helium, and the subscript 2 is the ___________________ for helium.

User MortenMoulder
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the superscript is the atomic mass and the subscript is the atomic number
User Sterling Christensen
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