The angular momentum of an electron in the n = 3 orbit of hydrogen is:

The angular momentum of an electron in…

Answer: 3h/2π.

A h/2π
B 2h/π
C 3h/2π
D 9h/2π

Correct answer: C. 3h/2π

Explanation: L = nh/2π = 3h/2π for n = 3.

Comparison of the Thomson model and the Rutherford model of the atom: in the Thomson plum pudding model alpha particles pass almost straight through a diffuse positive sphere, while in the Rutherford model a concentrated central nucleus deflects some alpha particles through large angles, with the lower panels showing the alpha particle source and gold foil and the observed result of wide-angle scattering

The Geiger–Marsden alpha-scattering result: a few alpha particles bounce back at large angles, which rules out Thomson’s diffuse model and demands a tiny, massive, positively charged nucleus. Image: Kurzon, CC BY 3.0, via Wikimedia Commons.

Concept context

Thomson's plum-pudding model, Rutherford's nuclear model from alpha-scattering, Bohr's postulates and hydrogen spectrum, spectral series (Lyman to Pfund), Rydberg formula, and limitations of each model.

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The angular momentum of an electron in the n = 3 orbit of hydrogen is:

Concept context

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