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Magnesium's atomic number is 12. Therefore, it has 12 protons and 12 electrons. Filling in the first 12 atomic orbitals gives us the configuration of 1s2 2s2 2p6 3s2.

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Which is the correct electron configuration for the ground state of a magnesium ion Mg2?

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What is the electron configuration for nitrogen anion with a charge of -2?

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