Given below are statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Energy of 2s orbital of sodium atom is greater than 2s orbital of potassium.
Reason (R): Energies of the orbitals in the same subshell decrease with increase in the
atomic number. Choose the correct answer from the options given below.

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Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but (R) is not the correct explanation of (A)

(A) is true but (R) is false.

(A) is false but (R) is true

answer is A.

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Detailed Solution

Energies of the orbitals in the same subshell
decrease with increase in the atomic number
$E_{2 s} (H) > E_{2 s} (L i) > E_{2 s} (N a) > E_{2 s} (K)$

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