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| Question | Answer |
| At atom consists of which particles? | Protons, neutrons and electrons |
| Protons: charge / mass / location | +1 1 nucleus |
| Neutrons: charge / mass / location | 0 1 nucleus |
| Electrons: charge / mass / location | -1 1/1840 in shells orbiting the nucleus |
| An atom has _____ number of protons and electrons and has _____ charge | An atom has an equal number of protons and electrons and has a no charge |
| An ion has _____ number of _____ and _____ and has a ______ or ______ charge | An ion has unequal number of protons and electons and has a positive or negative charge |
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