Chemistry · Structure of Atom

JEE Main 2025 — 28 January, Morning Shift — Question 38

In a multielectron atom, which orbitals described by quantum numbers have same energy in absence of electric and magnetic fields?

(A) $n=1,\ \ell=0,\ m_\ell=0$

(B) $n=2,\ \ell=0,\ m_\ell=0$

(D) $n=3,\ \ell=2,\ m_\ell=1$

(E) $n=3,\ \ell=2,\ m_\ell=0$

Choose the correct answer from the options given below :

Answer: D

In multielectron atoms, orbital energy depends on $n$ and $\ell$ , not on $m_\ell$ .

Orbitals with same $n$ and $\ell$ are degenerate.

Only D and E have $n=3,\ \ell=2$

Thus, they have same energy.

Answer key and solution verified before publishing.

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