How will you find the valency of chlorine, sulphur and magnesium?

 

Answer

(i) Chlorine

  • Atomic number of chlorine = 17
  • Electronic configuration of chlorine is - 2, 8, 7
  • Number of valence electrons = 7

 

  • Since atom has 7 valence electrons it is easier for the atom to gain 1 electron to achieve an octet.

 

Valency of atoms gaining 1 electron = 1

Therefore, Valency of chlorine = 1

 

 

(ii) Sulphur

 

  • Atomic number of Sulphur = 16
  • Electronic configuration of sulphur is - 2, 8, 6
  • Number of valence electrons = 6

 

  • Since the atom has 6 valence electrons it is easier for it to gain 2 electrons to achieve an octet .

 

Valency of atoms gaining 2 electrons = 2

Therefore, Valency of sulphur = 2

 

(iii) Magnesium

 

  • Atomic number of magnesium = 12
  • Electronic configuration of magnesium is - 2, 8, 2
  • Number of valence electrons = 2

 

  • Since the atom has 2 valence electrons it is easier for it to lose 2 electrons to achieve an octet .

 

Valency of atoms losing 2 electrons = 2

Therefore, Valency of magnesium = 2

  1. Class 9
  2. Chapter 4 Class 9 - Structure of Atom (Term 2)

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo