Question

The second element in third transition series is
(a)
Ac
(b)
Се
(c)
HE
(d)
La​

Answer 1

Answer:

Correct option is

C

Hf

d-block elements (transition elements) are divided into 4 series as following:

1) 3d series-Scandium to Zinc

2) 4d series- Yttrium to Cadmium

3) 5d series- Lanthanum to Mercury

4) 6d series- Actinium to Uub

Third transitional series is the 5d series. In 5d series, second element is Hf.

Answer 2

Answer:

c) HE is the answer for this