Where does this come from, and can I check it?

The 1913 model explained the sharp lines seen in the hydrogen spectrum. The figure is taken from NIST, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a science fact?

Yes. It sits on the Science shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

Bohr put electrons into fixed shells

The 1913 model explained the sharp lines seen in the hydrogen spectrum Niels Bohr proposed that electrons orbit the nucleus only at certain allowed energies and emit light when they drop between them. The energy gaps predicted hydrogen's spectral lines with striking accuracy. The model was later replaced by quantum mechanics, but the shell picture remains useful. It sits in Mondo's science collection, one of 200 facts that each trace back to the reference below.

Where this comes from

NIST

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

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Tags: physics, atoms, history

Bohr put electrons into fixed shells: the short answers

Where does this come from, and can I check it?: The 1913 model explained the sharp lines seen in the hydrogen spectrum. The figure is taken from NIST, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a science fact?: Yes. It sits on the Science shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.