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Alex777 [14]
3 years ago
6

Why do you think the mass number includes only the number of protons and neutrons?

Social Studies
1 answer:
prisoha [69]3 years ago
4 0

Answer:

The mass of electrons are so small that it is pretty much insignificant.

Explanation:

mass of proton = 1.673*10^-27

mass of neutron = 1.675*10^-27

mass of electron = 9.109*10^-31

the electron's mass is about 0.0005 times the mass of a neutron

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