Mg forms ionic bond to Cl by donating its valence electrons to two Cl atoms.
The electron configuration of Mg is [Ne]3s². It can achieve a complete octet by losing its two valence electrons to form Mg²⁺.
The electron configuration of Cl is [Ne]3s²3p⁵. It can achieve an octet by gaining one valence electron to form Cl⁻
.The oppositely charges of the magnesium and chloride ions attract each other and form ionic bonds.
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