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Charra [1.4K]
3 years ago
8

I don't know if this is a chemistry question but I need help its a science question from what I know!

Chemistry
1 answer:
Alex17521 [72]3 years ago
6 0

Answer:

The 3 rd answer

Explanation:

Atomic number is the number of protons in the nucleus of that element...

Mass number is the the sum of protons and neutrons in the nucleus of the atom..

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