Question

The last electron in d-block elements goes to
(a) (n-1) d (b) nd
(c) np (d) (n-1) s

Answer 1

Answer:

Answer is ...

a) (n-1) d

Answer 2

(b) nd

Explanation:

Transition metal ions generally possess one or more unpaired electrons. When visible light falls on a transition metal compound or ion, the unpaired electrons present in the lower energy d-orbital get promoted to high energy d-orbitals, called d-d transition, due to the absorption of visible light. Since, the energy involved in d-d transition is quantised, only a definite wavelength gets absorbed, remaining wavelengths present in the visible region gets transmitted. So transmitted light shows some colour complementary to the absorbed colour.

Option D is the answer.