The d-And-f-Block Elements

The d-And-f-Block Elements

Question

Account for the following :
The lowest oxide of transition metal is basic whereas the highest oxide is
amphoteric or acidic.

Answer

The lowest oxide of transition metal is basic because of some valence electron are not involved in bonding thus act as a base due to the availability of free electrons. The highest oxide of transition metal electrons of metal is involved in the bonding. Therefore, these electrons are not available for donation. Hence, they are acidic in nature.

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