Outline Bohr’s model of the atom (including neutrons)
Bohr’s model has a nucleus at the centre (made of protons and neutron) surrounded by electrons in an ‘orbit’ at various levels.
Compare the features of and the location of nucleus, protons, neutrons and electrons in the atom
| Particle | Charge | Location | Relative Mass | Location |
|---|---|---|---|---|
| Proton | +1 | Nucleus | 1 | Nucleus |
| Neutron | 0 | Nucleus | 1 | Nucleus |
| Electron | -1 | Valence Shell | 0 (1/1836) | Electron Shell |
Explain and use the terms mass number and atomic number
- Atomic Number: Number of protons in nucleus (also equal to number of electrons in shell)
- Atomic Mass: Sum of number of protons and number of neutrons
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