Ncert Exercises & Solutions

There are 14 elements in the actinoid series. Which of the following elements does not belong to this series?

1. U

2. Np

3. Tm

4. Fm

Hint: Tm is thulium

The elements in actinoid series is as folllows:

Actinium(Ac), Thorium(Th), Protactinium(Pa), Uranium(U), Neptunium(Np), Plutonium(Pu), Americium (Am), Curium(Cm), Berkelium(Bk), Californium(Cf), Einstenium(Es), Fermium(Fm), Mendelevium(Md), Nobelium(No), and Lawrencium(Lr).

Tm(Z = 69)do not belong to the actinoid series. The actinoid series is with atomic numbers 89 to 103. Thulium (Tm) has atomic number 69 belongs to lanthanoids (4f series).

NEET Information

courses

Company

Botany Questions

Chemistry Questions

Physics Questions

Zoology Questions