Magnesium Chloride (MgCl 2) - One atom of Magnesium + Two atoms of Chlorine
Magnesium Chloride is formed through ionic bonding of Magnesium and Chlorine. Magnesium has 2 valence electrons while Chlorine has 6 valence electrons. In order for the formation Magnesium Chloride, Magnesium must give away his 2 valence electrons to Chlorine while Chlorine must receive 1 more electron from Magnesium to form a fully-filled valence shell. In order for Magnesium to give away its 2 valence electron, two atoms of chlorine needed as an atom of Chlorine only requires one electron. Thus Magnesium Chloride is formed when 1 atom of Magnesium combines with 2 atoms of Chlorine.
Dot and Cross Diagram
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