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Lelu [443]
3 years ago
10

THIS IS SO IMPORTANT PLEASE HELP!

Chemistry
1 answer:
jeka943 years ago
4 0
Protons: 12
Neutrons: 12
<span>Electrons: 12

The atomic number of Magnesium is 12, so it has to have 12 protons. The atomic mass of Magnesium is 24, so it has to have 12 neutrons since 12+12=24 (electrons don't have weight). You can tell it has 12 electrons because the electrons are always the same number as the protons.</span>
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