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2 electrons there will be only 3 shells these shells are filled with electrons in this order; 2, 8, 8. But as you only have twelve there is no second eight it just has 2 electrons in that shell, lol well anyways the answer is two.

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15y ago
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15y ago

The atomic number is equal to the number of protons and the number of electrons, so 12.

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9y ago

magnesium is a metal element. atomic number of it is 12.

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13y ago

12. Any neutral atom has the same number of electrons as the atomic number of the atom.

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11y ago

Magnesium atoms, atomic number 12, have 2 electrons in their outermost shell.

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11y ago

This element, magnesium, normally has 2 electrons in its outermost shell.

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9y ago

Magnesium is a s block element. We use it for make alloys. It got atomic number of 12.

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Q: How many electrons does an atom have with an atomic number of 12?
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