Question

Q.7
Assertion (A):Nat belongs to 18th group of the periodic table.
Reason (R):The electronic configuration of Na+ is [Hel²s22p6
both A and R are true but R is not the correct explanation of A
2)
A is false but R is true
3)
both A and R are true and R is the correct explanation of A
4)
A is true but R is false​

Answer 1

Answer:

4 .

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