Question

Name the lightest alkali metal.

Answer 1

About Alkali metals-

• They are the elements in the periodic table which occupy the first group i.e. Group IA.
• They are very reactive.
• They must stored under oil to keep air and water away.

Reason-

• When group IA elements react with water, they form metal hydroxide which have pH more than 7.
• Metal hydroxide is alkaline in nature
• Hence, they are called alkali metals

Lightest alkali metal-

• Lithium is the lightest metallic element.as it has Due its lowest atomic mass and very low density.