fabioladarielis fabioladarielis

22-09-2019
Social Studies

contestada

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

Respuesta :

Аноним Аноним

22-09-2019

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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