Why is the absorption spectrum of atomic hydrogen different from that of helium?
A) The energy differences between orbitals in hydrogen are different from those in helium.
B) Helium has more neutrons than hydrogen.
C) There is usually more hydrogen than helium in stars.
D) Hydrogen atoms have a lower mass, and are therefore faster.

Question

Quizplus · Accepted Answer

The absorption spectrum is determined by the energy differences between electron orbitals. Hydrogen and helium have different electron configurations, leading to different energy levels and thus different absorption spectra.

Why Is the Absorption Spectrum of Atomic Hydrogen Different from That