Question

Na+ has completely filled K and L shells. Explain

NCERT Class IX
Sciences - Main Course Book

Chapter 4. Structure of the Atom

Answer 1

Na+ is a positively charged sodium ion. Normally an atom of sodium has 11 electrons, so according to formula it has 2 electrons in K shell , 8 electrons in L shell and 1 electron in M shell. However Na+ has 10 electrons only, therefore it has 2 electrons in K shell and 8 in L shell. 2 and 8 are the full capacity of the K and L shell respectively. Hence it is said ' Na+ has completely filled K and L shells. '

Answer 2

Answer:-

Atomic number of sodium (Na) = 11

No. of electrons in Na = 11

No. of electrons in Na+ = 11 – 1 = 10

Electronic configuration of Na+ → 2, 8

K L

Thus, in Na+, K and L shells are completely filled.

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