Transitional elements exhibit variable valences because they release $e^{-}$ from

ns orbital

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ns & np orbitals

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(n – 1)d & ns orbitals

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(n – 1)d orbitals

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Solution

The correct option is C (n – 1)d & ns orbitals
Transition elements show variable oxidation states because of very small energy difference between (n-1)d and ns-orbitals.

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e^{-}

Variable valency of transition elements is on account of :

d

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