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How many valence electrons are in an atom of magnesium?
Magnesium has two .
Magnesium is element 12 and belongs to Group 2 of . An element in Group 2 has two .
Also, the of Mg is 1s² 2s²2p⁶ 3s² or [Ne]3s². Since the 3s² electrons are the outermost electrons, magnesium has two valence electrons.