# 4.1.8 Bohr's Model of the Atom

### Bohr's Model of the Atom

• In 1913 the Danish Physicist, Niels Bohr, came up with an improved model of the atom
• He used the nuclear model to create his model
• In the Bohr model of the atom:
• Electrons orbit the nucleus at different distances
• The different orbit distances are called energy levels
• Up to 2 electrons orbit in the first energy level
• Up to 8 electrons can orbit in the second energy level
• Up to 8 electrons can orbit in the third energy level In the Bohr model of the atom electrons orbit in distinct energy levels, which are at different distances from the nucleus

#### Successes of the Bohr Model

• The Bohr model became the accepted model because:
• It was able to explain the findings from different experiments better than the nuclear model of the atom
• It was able to explain the processes of absorption and emission of electromagnetic radiation
• Theoretical calculations made using the Bohr model agreed with experimental results

#### Worked Example

The Bohr model of the atom replaced the nuclear model of the atom.

Describe the main advantage of the Bohr model over the nuclear model.

Step 1: Describe the difference between the two models

• The nuclear model describes the atom as having a positively charged nucleus with electrons orbiting it
• The Bohr model is similar to the nuclear model in that it describes the atom as having a positively charged nucleus but the electrons orbit at specific distances in distinct energy levels

Step 2: Describe why the Bohr model was better

• The Bohr model could explain the findings of experiments better than the nuclear model ### Author: Ashika

Ashika graduated with a first-class Physics degree from Manchester University and, having worked as a software engineer, focused on Physics education, creating engaging content to help students across all levels. Now an experienced GCSE and A Level Physics and Maths tutor, Ashika helps to grow and improve our Physics resources.
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