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30 June, 15:17

Determine the number of valence electrons for magnesium

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  1. 30 June, 17:26
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    Magnesium has 2 valence electrons.

    Explanation:

    The atomic number of magnesium is 12. This means that it has 12 protons and 12 electrons. The first electron shell can hold 2 electrons, the second can hold 8, so the third will have 2 electrons. The outermost shell of the atom has two electrons. Therefore, magnesium has 2 valence electrons.
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