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I need help with Number 61 please

I need help with Number 61 please
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5 votes
I need help with Number 61 please

I need help with Number 61 please-example-1
User Jill
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1 Answer

2 votes

Answer:

40 (superscript) is the mass number aka atomic mass, and 19 (subscript) is the atomic number aka number of protons and electrons.

User ZZZ
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