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24-03-2018
Chemistry

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in the symbol 42He, the subscript 2 is the _ for helium and the superscript 4 is the _ for helium.

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stacihewitsonp62pok stacihewitsonp62pok

24-03-2018

The subscript 2 is the atomic number. This tells you the number of protons in the atom. The superscript 4 is the mass number. This tells you the protons + neurons

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