Correct decreasing order of the energy of 2s orbital in the following atoms H, Li, Na, K

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E2s(H)>E2s(Li)>E2s(Na)>E2s(K)

E2s(H)>E2s(Na)>E2s(Li)>E2s(K)

E2s(H)>E2s(Na)=E2s(K)>E2s(Li)

E2s(K)>E2s(Na)>E2s(Li)>E2s(H)

answer is A.

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Detailed Solution

Energies of orbitals of same subshell decreases with the increase in effective nuclear charge(Zeff)

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