How many elements of Ist transition series have half filled d-subshell ?

The transition elements have

How many elements are present in the first transition series ?

+ 4 ion of which has half-filled 4f subshell?

A M^(+2) ion derved fromn a metal in the first transition metal series has four electrons in 3d subshell , what element may m be:

A M^(2+) ion derived from a metal in the first transition metal series has four electrons in 3d subshell. What element might M be?

Comment on the statement that elements of first transition series possess many properties different fromt those of the havier transition elements.

How many of the transition elements are called Platinum metals.

How many of the transition elements are called coinage metals.

Zn,Cd,Hg are d-block elements but not transition elements because They have full filled 'd' orbitals. They have half-filled 'd' orbitals They have completely filled 's' orbitals All of these