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Question

Why do alkali metals have low density?


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Solution

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.

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