Which of the following statements regarding transition elements is incorrect?
- AFor the first five transition elements ($Sc$ to $Mn$),all $4s$ and $3d$ electrons are used for bonding in their highest oxidation states.
- BAs the number of $3d$ electrons increases,the tendency to participate in bonding decreases.
- CTransition elements can exhibit zero oxidation state in complexes.
- DIn their highest oxidation states,transition metals exhibit basic properties and form ionic compounds.
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Transition elements exhibit variable valencies because they release electrons from the following orbits:
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View SolutionGiven below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: In $T \ell I_{3}$,isomorphous to $CsI_{3}$,the metal is present in $+1$ oxidation state.
Reason $R$: $T \ell$ metal has fourteen $f$ electrons in the electronic configuration.
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Reason $R$: $T \ell$ metal has fourteen $f$ electrons in the electronic configuration.
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