JEE Main · 2005 · 08 May 2005 · Offline · Atomic Structure

Which of the following statements in relation to the hydrogen atom is correct?

(A)3s orbital is lower in energy than 3p orbital
(B)3p orbital is lower in energy than 3d orbital
(C)3s and 3p orbitals are of lower energy than 3d orbital
(D)3s, 3p and 3d orbitals all have the same energy✓ Correct

Answer: (D)

Solution

Hydrogen has only one electron, and for a one-electron atom the orbital energy depends solely on the principal quantum number

n

, with no contribution from the shape

l

. All the

n = 3

orbitals,

3 s

3 p

and

3 d

alike, therefore sit at the same energy and are degenerate. That degeneracy is broken only in many-electron atoms, where electron repulsion and penetration separate

3 s

3 p

and

3 d

JEE Main · 2005 · 08 May 2005 · Offline · Single correct option

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