Class 11 Chemistry The S Block Elements Physical Properties of alkali metals

Physical Properties of alkali metals

  • Alkali metals appears silvery white, soft and.
  • They have low density due to their large size which goes on increasingdown the group.
  • The melting and boiling point of the alkali metals are low.
  • This shows that they have weak metallic bonding.
  • There is a weak bonding due to thepresence of only a single valence electron.
  • These metals impart colour when exposed to oxidizing flame due to the excitation of the outermost electron to a higher energy level and then return to their ground state by emitting radiation.

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