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  • There are three isotopes of hydrogen viz., protium, deuterium (non radioactive) and tritium (radioactive).
  • Hydrogen resembles alkali metals and also halogens in the periodic table.
  • Dihydrogen is prepared by the electrolysis of water and it can combine efficiently with metals and non metals forming the corresponding hydrides.
  • The high bond dissociation of enthalpy of H-H is made use of in atomic hydrogen welding torch.
  • Saline hydrides and metallic hydrides are the two important class of hydrides.
  • Water has bent shape with a bond angle of 104.5o.
  • Crystalline form of ice gains significance in possessing hydrogen bonding and ensuring the survival of aquatic life through thermal insulation in lakes.

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