1.

Oxygen is divalent in its compounds, but sulphur is even hexavalent. Why?

Answer»

SOLUTION :LITHIUM and Magnesium have certain SIMILARITIES in their properties. Hence, they are called diagonally RELATED PAIR of elements.
The reasons are
(a) Li and Mg have similar electronegativity.
(b) `Li^(+)` and `Mg^(2+)` have similar polarising power.


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