Question

What is the lightest Alkali Metal?

Answer 1

Alkali metals:

• The element of group 1 in the periodic table are highly reactive in nature and reacts with water to form an alkaline solution with the evolution of hydrogen gas.
• So, due to the formation of alkaline solution, group 1 elements except hydrogen are known as alkali metals.

The Lightest Alkali metals:

• The lightest alkali metal is Lithium $\left(\mathrm{Li}\right)$.
• Lithium has the lowest atomic weight in group 1 and hence is the lighter element.