vinnysclash217 vinnysclash217

20-03-2017
Chemistry

contestada

. 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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KingOfShadows KingOfShadows

20-03-2017

the superscript is the atomic mass and the subscript is the atomic number

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