Transition elements exhibits variable valencies because they release electrons from the followin...

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Transition elements exhibits variable valencies because they release electrons from the following orbits
(1) \( \mathrm{ns} \)
(2) \( n s \) and \( \mathrm{np} \)
(3) \( (\mathrm{n}-1) \mathrm{d} \) and \( n s \)
(4) \( (n-1) d \)
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