If Z = 3, what would be the valency of the element? Also, name the element.

 

Answer

  • Z represents the atomic number of an element.
  • Z = 3 means, atomic number = 3
  • That is, number electrons/protons = 3
  • 3 electrons are accommodated different shells as follows,

K Shell = 2 e -

L Shell = 1 e -

 

  • Now, since the L shell has only 1 e - , it will lose it to become more stable.
  • Since the atom loses 1 e - , its valency will be 1 .

 

We know that Atomic Number of Lithium is 3,

Hence, the element is Lithium (Li).

  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