vbpnsp472m vbpnsp472m

05-03-2022
Chemistry

contestada

What is the mass number of an element that has 21 protons, 21 electrons, and 22
neutrons?

Respuesta :

05-03-2022

Answer:

43

Explanation:

Mass number(M) = Proton number + Neutron number

M=21+22

M=43

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