Parts of the Atom
Atoms are really small and make up everything around us:
At the centre is a nucleus made up of protons (positive) and neutrons (neutral)
This is surrounded by shells of electrons (negative)
This is how we can show the number of different types of particles in a particular atom.
You should remember that:
Atoms have an equal number of protons and electrons
Ions have a different number of protons and electrons, so are positive or negative
Isotopes are atoms with the same number of protons but a different number of neutrons
Representing Atoms: Example
This is how to work out the number of particles in some atoms and ions.
The Alpha Scattering Experiment
An in-depth look at the experiment that led to the nuclear model of the atom.
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