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  • What are the physical properties of alkali elements in the periodic table

What are the physical properties of alkali elements in the periodic table?

 

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  • They are silvery white in color.
  • They are soft and light metals.
  • The density of these elements is generally low and increases while moving down from Li to Cs.
  • They have only one electron in their outermost shell. Hence, they form weak bonds. This results in low melting and boiling point.
  • They transmit characteristic color to an oxidizing flame. This happens because the heat provided by the flame excites the electron and it moves to a higher energy. When the excited electron moves back to the ground state, it imparts radiation in the visible region. This property of alkali metals helps in detecting metals from their respective flame test.
  • The property of emission of light makes potassium and cesium useful in the making of electrodes of photoelectric cells.
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Satyajeet kumar

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