# Give reasons for the following : (a) Transition metals form complex compounds.(b) $E^0$ values for $\left ( Zn^{2+}/Zn \right )\: \: and\: \: \left ( Mn^{2+}/Mn \right )$ are more negative than expected.(c) Actinoids show wide range of oxidation states.

(a) It is because of smaller size of metal ions, high iconic charges and availability of vacant d-orbitals.

(b) It is because of extra stability of $d^5\: \: \: and\: \: \: d^{10}$ electronic configuration.

(c) It is because of less energy difference between 5s, 6d and 7d orbitals.

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