Question

In which of the following elements d-orbitals do not have any electrons in their outer electronic configuration :
(1) Am (2) Lr (3) Th (4) Lu

Answer 1

Among the given options -

(1) Am (2) Lr is correct answer.

Americium has electronic configuration [Rn]5f77s2.

It belongs to period 7 block f. It is radioactive in nature. It is part of actinides series.

Lawrencium has electronic configuration [Rn]5f147s27p1. It belongs to actinide series. It belong to period 7 block f. It is radioactive in nature.

Thorium has electronic configuration Rn 6d2 7s2. It belongs to actinide series. It belong to period 7 block f. It is radioactive in nature.

Lutetium has electronic configuration [Xe]4f145d16s2.

It belongs to lanthanide series. It belong to period 6 block f.