how to find valency of an element?

  • Valency of element is the no. of electron participating in chemical combination. 
  • Actually it is the valence shell which is involved in chemical combination. 
  • Therefore if electron present in valence shell is less than 3 than valency is directly equal to number of electron in valence shell.
  • If electrons present in valence shell are greater than three than 8- no. of valence electrons.
  • To find electrons in valence shell one should know atomic number. For eg for Al electronic configuration is 2,8,3 as atomic number is 13.  Thus valency is 3 as valence shell electron equals to three.  N electronic configuration 2,8,5 valency = 8-5 = 3.

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