Which of following statement is wrong for transition element ?
(A) Once the d5 configuration nis exceeded the tendency to involve all the 3d electrons in bonding decreases.
(B) In addition to the normal oxidation states, the zero oxidation state is also shown by these elements in complexes.
(C) In the highest oxidation states, the transition metals show basic.
(D) In the highest oxidation states of the first five (transition elements (Sc to Mn) all the 4s & 3d electrons are used for bonding ?