In context with the transition elements, which of the following statements is incorrect?

In the highest oxidation of the first five transition elements ($\mathrm{Sc}$ to $\mathrm{Mn}$), all the $4\mathrm{s}$ and $3\mathrm{d}$ electrons are used for bonding?

Once the ,${\mathrm{d}}^5$ configuration is exceeded the tendency to involve all the$3\mathrm{d}$ electron bonding decrease.

In addition to the normal oxidation  state the zero oxidation  state  is also shown by these elements in complexes.

In the highest oxidation state , the transition  metal show basic character and form cationic  complexes.