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Given below are two statements. One is labelled as Assertion \( \mathrm{A} \) and the other is labelled as Reason \( \mathrm{R} \). Assertion \( \mathrm{A} \) : Energy of \( 2 \mathrm{~s} \) orbital of hydrogen atom is greater than that of \( 2 \mathrm{~s} \) orbital of lithium.
Reason \( \mathrm{R} \) : Energies of the orbitals in the same subshell decrease with increase in the atomic number. In the light of the above statements, choose the most appropriate answer from the options given below:
(a) Both (A) and (R) are correct but (R) is not the correct explanation of (A)
(b) (A) is correct but (R) is not correct.
(c) (A) is not correct but (R) is correct.
(d) Both (A) and (R) are correct and (R) is the correct explanation of (A)
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