Question

Why do alkali metals have low density?

Answer 1

Alkali Metals: Alkali metals are the elements of group 1 because these elements react with water to form an alkaline solution with the evolution of hydrogen gas.

Example: Lithium (Li), Sodium (Na), etc.

Density is defined as the ratio of mass to volume.

• Alkali metals have low atomic mass and large atomic size.
• Due to the large atomic size, the volume of alkali metal is large.
• Hence, the density of alkali metal is low.