What is the valency of magnesium and chlorine in magnesium chloride?

Magnesium (Atomic number = 12) has electronic configuration 2, 8, 2. It loses 2 electrons to complete octet configuration in its valence shell. Chlorine (Atomic number = 17) has electronic configuration 2, 8, 7. It gains 1 electron to complete octet configuration in its valence shell.

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