Na + has completely filled K and L shells. Explain.

 

Answer

Na + is an ion having a positive charge of +1

Positive charge of +1 indicates that the ion has 1 less electron than the stable neutral atom.

 

We know that,

 

Atomic number of Na (Sodium) = 11

That is, number of electrons in outer shell of Na = 1

Electronic configuration of Na is as follows:

K shell = 2 e -

L Shell = 8 e -

M Shell = 1 e -




Na + has 1 less electron than Na.

Therefore, number of electrons in Na + = 11 - 1 = 10 e -  

 

Electronic configuration of Na + is as follows:

K shell = 2 e -

L Shell = 8 e -

 

Now K and L Shell can contain maximum 2 and 8 electrons respectively. ( 2n 2 rule)

Hence, they have completely filled K and L shells with 10 electrons .

  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