Chemistry, 26.10.2019 20:43 jackfrost5
In the symbol 4 2he, the superscript 4 is the for helium and the subscript 2 is the for helium.
a. atomic number; mass number
b. mass number; atomic number
c. atomic number; atomic mass
d. atomic mass; atomic number
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In the symbol 4 2he, the superscript 4 is the for helium and the subscript 2 is the for helium.
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