AQA · GCSE · Combined Science
Course version: 8464 · Version from Sept 2018
Niels Bohr adapted the nuclear model by suggesting that electrons orbit…
Full specification wording
The development of the model of the atom (common content with chemistry): Niels Bohr adapted the nuclear model by suggesting that electrons orbit the nucleus at specific distances. The theoretical calculations of Bohr agreed with experimental observations.
After Rutherford's nuclear model, scientists asked how electrons are arranged.
Checked against the AQA 8464 specification (opens in a new tab) on .
- Point 5 of 10
- 3 key terms
Study notes
From the checked teaching notes for this specification point.
The idea
After Rutherford's nuclear model, scientists asked how electrons are arranged. Bohr proposed that electrons orbit the nucleus only at specific distances, called energy levels or shells, rather than at any distance. This fixed arrangement explained patterns in experimental observations, such as line spectra, that earlier models could not. Bohr's theoretical calculations matched these observations, so his adapted model was accepted. To use this, describe electrons in fixed shells around a positive nucleus, then explain that agreement with evidence is why a model becomes accepted. A useful method is to compare a continuous spread of electron positions with fixed shells and ask which fits the observed patterns.
What earns the marks
- Bohr adapted the nuclear model by placing electrons in orbits around the nucleus.
- The orbits are at specific distances from the nucleus, not at any arbitrary distance.
- Bohr's theoretical calculations agreed with experimental observations, which supported the model.
- Agreement between theory and evidence is why the adapted model was accepted over earlier arrangements.
Common mistakes and how to put them right
Saying electrons orbit at any distance from the nucleus.
Put it right: State that electrons occupy defined energy levels or shells.
Confusing Bohr's adaptation with the discovery of the nucleus.
Put it right: Keep the two contributions separate.
Claiming Bohr proved the model with no evidence.
Put it right: Describe the role of supporting evidence.
Exam tips
- Use the phrase 'specific distances' or 'energy levels' when describing Bohr's suggestion, as vague wording such as 'around the nucleus' loses the key idea.
- When asked why the model was accepted, refer to agreement between theoretical calculations and experimental observations.
- Keep the sequence clear: Rutherford's nuclear model first, then Bohr's adaptation placing electrons in fixed orbits.
Try the lesson
The start of the The development of the model of the atom (common content with chemistry): Niels Bohr adapted the nuclear model by suggesting that electrons orbit the nucleus at specific distances. The theoretical calculations of Bohr agreed with experimental observations. lesson, made from checked teaching notes for this specification point.
Have a go first
In the Bohr model of the atom, what path do the electrons take around the nucleus?
Listen
After Rutherford's nuclear model, scientists asked how electrons are arranged. Bohr proposed that electrons orbit the nucleus only at specific distances, called energy levels or shells, rather than at any distance. This fixed arrangement explained patterns in experimental observations, such as line spectra, that earlier models could not. Bohr's theoretical calculations matched these observations, so his adapted model was accepted. To use this, describe electrons in fixed shells around a positive nucleus, then explain that agreement with evidence is why a model becomes accepted. A useful method is to compare a continuous spread of electron positions with fixed shells and ask which fits the observed patterns. A strong answer earns marks for these points. Bohr adapted the nuclear model by placing electrons in orbits around the nucleus. The orbits are at specific distances from the nucleus, not at any arbitrary distance. Bohr's theoretical calculations agreed with experimental observations, which supported the model. Agreement between theory and evidence is why the adapted model was accepted over earlier arrangements. A common slip: Saying electrons orbit at any distance from the nucleus: Bohr proposed specific, fixed distances. Instead, state that electrons occupy defined energy levels or shells. Exam tip: Use the phrase 'specific distances' or 'energy levels' when describing Bohr's suggestion, as vague wording such as 'around the nucleus' loses the key idea.
See it
Put it in order
Put these steps in the order they happen.
- 1. Electrons orbit the nucleus at specific distances
- 2. Bohr adapted the nuclear model
- 3. Nuclear model
- 4. Adapted model accepted
- 5. Agreed with experimental observations
- 6. Bohr's theoretical calculations
Key words
Say what each word means before you turn the card.
Development of the atomic model
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Role of evidence in accepting scientific models
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Theory and experiment in science
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See every definition
- Development of the atomic model
- Bohr adapted the nuclear model by suggesting that electrons orbit the nucleus at specific distances.
- Role of evidence in accepting scientific models
- The theoretical calculations of Bohr agreed with experimental observations, so his adapted model was accepted.
- Theory and experiment in science
- The theoretical calculations of Bohr agreed with experimental observations.
Label the diagram
Some boxes have lost their names. Pick the right name for each number.
1Box 1
2Box 2
3Box 3
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