Which of the d-block elements are not referred to as the transition elements ?

Options

A. Group 9
B. Group 12
C. Group 10
D. Group 13

Answer

B

Explanation

Transition elements are those d-block elements which have incompletely filled (n-1) d subshells either in their atomic state or in their common ionic states. On the basis of incompletely filled 3d subshell in case of scandium atom in its ground state `(3d^(1) 4s^(2))`, it is regarded as a transition element. On the other hand, Zinc atom (Group. 12) has completely filled 3d subshell `(3d^(10))` in its atomic state as well as in its + 2 state hence it is not regarded as a transition element. Silver atom has completely field (n-1) d subshell in the ground state of its atom `(4d^(10) 5s^(1))`, but it is a transition element because it shows oxidation state of `+ 1(4d^(10))`, `+ 2(4d^(9))` and `+3(4d^(8))`.