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What do you expect the nature of hydrides is if formed by elements of atomic numbers 15,19,23 and 44 with dihydrogen Compare their behaviour to

9.33 What do you expect the nature of hydrides is, if formed by elements of atomic numbers 15, 19, 23 and 44 with dihydrogen? Compare their behaviour towards water

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R Rakesh

Answer-

Atomic Number 15 19 23 and 44 are phosphorus, potassium, vanadium, and ruthenium respectively.

hydrides of these elements are 

(i)PH_{3}- its an electron rich species also a covalent molecule.   

        a lone pair of electron.

(ii)Hydrides of potassium- dihydrogen forms an ionic hydride. It is crystalline and non-volatile in nature 

    

(iii) hydrides of vanadium and ruthenium- Both elements belong to d- block. They form metallic and non-stoichiometric hydrides. They are metallic in nature.

 

Behavior towards water-

  • D block element does not react with water
  • phosphorus reacts with water (behave as Lewis base and accept H^{+} and form PH_{4}^{+})
  • potassium react with water and form KOH and liberate hydrogen gas
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