kelseynicole531 kelseynicole531
  • 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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