Mg2+: [1s22s22p6]
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The electron configuration for a magnesium cation Mg2 plus is 1s2.2s2.2p6.
The noble gas configuration of Mg2+ is [Ne] because the magnesium atom loses two electrons to form the Mg2+ ion. The electron configuration of Ne is 1s2 2s2 2p6, so when Mg loses its two valence electrons, it achieves a stable electron configuration similar to that of the noble gas Ne.
Magnesium is typically found as a positive ion, written as Mg2+. It loses two electrons to achieve a stable electronic configuration.
Magnesium, ion (Mg2+)
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