Level 1

A significant reduction in atomic size with increase in atomic number is a characteristic of elements of

Lanthanoids are

The lanthanide contraction relates to

Which of following statements is not correct?

Most common oxidation states of $\mathrm{Ce}$ (cerium) are

Arrange ${\mathrm{Ce}}^{3+}, {\mathrm{La}}^{3+}, {\mathrm{Pm}}^{3+}$ and ${\mathrm{Yb}}^{3+}$ in the increasing order of their ionic radii.

Actinides:

The value of the 'spin only' magnetic moment for one of the following configurations is $2.84\mathrm{BM}.$ The correct one is