For an atom of hydrogen without the effects of an external magnetic field, an electron transition from the 3P subshell to the 2P subshell is called a forbidden transition. Why is this so?

a. Electrons in hydrogen are forbidden from transitioning in that way due to peculiarities unique to solutions of Schrödinger's equation for hydrogen.
b.The normal Zeeman effect prohibits certain transitions from occurring.
c. Since the electron at low energies must pass through the nucleus, nuclear effects prevent certain transitions to orbits through the nucleus.
d.An atom that changes energy through transitioning must either absorb or emit a photon.

d.
A photon must be emitted when the electron transitions from n = 3 to n = 2, and the photon carries a specific angular momentum of l = ±1. The transition from a P subshell to another Psubshell, both with angular momentum l = 2, is therefore forbidden.

Physics & Space Science

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