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In s- and p-block elements the OS. chang...

In `s`- and `p`-block elements the `OS`. changes in units, but in transition elements it changes it chnages in units of one. Explain ?

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This is due to a pair of electrons remaining paired in -ous from and becoming unapaired in `-ic`, bonding [e.g. `Sn, P, Te` etc. (`p`-block)].
But in transition elements different number of `d`-electrons may take part in bonding [e.g. `Fe^(2+), Fe^(3+)` and `Cu^(o+)` and `Cu^(2+)` etc.].
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