Class 11 Chemistry The S Block Elements Physical Properties of alkaline earth metal

Physical Properties of alkaline earth metal

  • The alkaline earth metals are silverywhite, soft and lustrous.
  • But they are somewhat harder than alkali metals.
  • Beryllium andmagnesium are greyish in colour.
  • Melting and boiling points of these metalsare higher than corresponding alkali metal.
  • They have low ionizationenthalpy which makes them strongly electropositive that increasesdown the group from Be to Ba.
  • When exposed to flame calcium, strontium and barium imparts brick red, crimson and apple green colours

  • They impart characteristic colour due to excitation of electrons to higher energy levels and then dropping back to the ground state.
  • But Beryllium and magnesium do not impart colour due to their very small size.
  • The elements emit this energy in the form of visible light.
  • They have high electrical and thermal conductivities.

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