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| Question | Answer |
| WHAT IS AN ATOM? | An atom is the smallest particle of an element that has all the chemical properties of that element |
| Atomic Theory | Plum Pudding Model |
| Sub-atomic Particles | |
| Electronic configuration It's how electrons are arranged in an atom | Energy levels |
| Atomic Number This is the number of protons in an atom Number of protons = Number of electrons e.g Na has 11 protons, so it's atomic number is 11 | Mass Number This is the total number of protons + neutrons in the atom. E.g a Sodium atom that has 11 protons and 12 neutrons will have a mass number of 23 |
| Nuclide Notation how to represent atoms by displaying their atomic and mass numbers | |
| Nucleons | Isotopes Atoms of the same element that have different number of neutrons |
| Relative Atomic Mass (R.A.M) How many times does the mass of 1/12 th the mass of carbon fit into one atom of that element |
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