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Chemistry CBSE Live product
Class 9 (2026-27)
Journey Inside the Atom
Valency, Isotopes & Isobars
2.
Valence electrons
Question:
1
m.
Pick the correct choice for the following assertion-reason pair:
Assertion (A):
Elements with a completely filled outer shell have zero valency.
Reason (R):
These elements can easily lose or gain electrons.
A is true but R is false
A is false but R is true
Both A and R are true, and R is not the correct explanation of A
Both A and R are true, and R is the correct explanation of A
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