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Part A
Construct an electron arrangement for Mg by indicating how many electrons are in the first, second, and third energy levels.

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Answer:

The first shell, n=1, can hold up to 2 electrons, so 2 of the 12 electrons in magnesium will occupy the first shell. This leaves 12−2=10 electrons to place. The second shell can hold up to 8 electrons, so 8 of the remaining electrons will be in the n=2 level and the 2 remaining electrons will be in the third level.

Explanation:

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