Question

Which of the following is not an actinoid?
(a) Curium (Z = 96)
(b) Californium (Z = 98)
(c) Uranium (Z = 92)
(d) Terbium (7 = 65)​

Answer 1

Explanation:

Terbium (Z = 65) is a lanthanoid and all others are actinoids. Lanthanoids have atomic numbers from 58 to 71. Actinoids have atomic numbers from 90 to 103.

Answer 2

Answer:

d) terbium (z=65)

Explanation:

elements with atomic number z=90-103 are antanoid terbium belongs to lanthanoid