Q11 of 21 Page 102

State the valencies of the following elements : Magnesium and Sodium .

MAGNESIUM:Magnesium has an atomic number 12. Hence its electronic configuration is 2, 8, 2. Therefore it can lose two electrons to complete its octet (8 electrons in outermost shell). Hence its valency is 2

SODIUM: Sodium has an atomic number 11. Hence its electronic configuration is 2, 8, 1. Therefore it can lose one electrons to complete its octet (8 electrons in outermost shell). Hence its valency is 1.


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