f-block elements are also known as …………

Which of the following forms a bridge between reactive s-block elements and less reactive group 13 and 14 elements?

………… elements are known as chalcogens.

The name ‘rare earth elements’ is used for …………

Aluminium belongs to …………. elements.

The CORRECT order of radii is …………

The CORRECT order of increasing radii of the elements Na, Si, Al and P is …………

The metallic and nonmetallic properties of elements can be judged by their …………

Which element has the most negative electron gain enthalpy?

Which of the properties remain unchanged on descending a group in the periodic table?