JEE Advanced 2026 Chemistry question
The 2s and the 2p orbital energies of hydrogen atom are and , respectively. The 2s and the 2p orbital energies of lithium atom are and , respectively. The correct option(s) about the orbital energies is(are)
Answer: (A),(B),(D)
Solution
In hydrogen the energy depends only on n, so 2s and 2p are degenerate (B), both at −3.4 eV. In lithium, shielding by the 1s² core and the greater penetration of 2s make (A). The Li
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