C and S are always tetravalent but Ge, Sn And Pb show divalency. Why?

1.	C and S are always tetravalent but Ge, Sn And Pb show divalency. Why?
Answer» Inert pair is more prominent as we move down the group in p – block elements. Ge, Sn and Pb show divalency due to inert pair effect.

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