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Anywhere from 36 to 38, however, this is assuming you are talking about neutral atoms. The variation comes from the different stable isotopes of Magnesium, of which there are three.

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13y ago
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9y ago

Magnesium has 12 electrons and protons; the number of neutrons is specific for each isotope.

Number of neutrons in a magnesium isotope = Mass number - 12

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3y ago

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Q: How many subatomic particles are in magnesium?
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