Chapter 4

NCERT
Class 9
Science
Solutions
1. How will you find the Valency of Chlorine, Sulphur and Magnesium?

Question:

If the K and L shells of an atom are full, then what would be the total number of electrons in the atom?

Answer:

Maximum number of electrons that can occupy the K shell =2

Maximum number of electrons that can occupy the L shell =8

Total number of electrons in the atom =2+8=10

If the K and L shells of an atom are full, then there would be 10 electrons in the atom.

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