protons and neutrons are in the middle and form the nucleus, electrons are arranged at different distances from the nucleus
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Charges
neutrons: n/a, protons:+1, electrons:-1
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Isotopes
An element has different numbers of neutrons but same number of protons
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How to work out protons, neutrons and electrons
Electrons: mass number, protons: atomic number, neutrons: mass number/electrons-atomic number/protons
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Ionisation
An atom gains or looses electrons-becomes charged
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Energy levels
Electrons occupy the space around the nucleus at specific distances/energy levels. the level can only change if the atom absorbs or emits electromagnetic radiation i.e. light
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