formula, the chemical symbols of atoms or molecules showing the elements, atom, smallest part of an element that can exist, 100, approximate number of elements that are known, Periodic Table, where the elements are organised in atomic number order, energy change, can be detected in a chemical reaction eg light given off or gets hotter, electron, negative sub-atomic particle discovered by Niels Bohr, purification, the process of removing impurities, plum pudding, the original model of the atom where it was thought negative electrons were embedded in a positive ball, alpha particle scattering, experiment that showed the atom has a nucleus at the centre, James Chadwick, scientist who discovered neutrons were in the nucleus, proton, sub-atomic particle with charge of +1, neutron, sub-atomic particle with no charge, mass number, the number of protons added to the number of neutrons, atomic number, the number of protons in an atom, isotopes, atoms of an element with different numbers of neutrons, 1 x 10-10m, equal to the radius of an atom (0.1 nm), percentage abundance, a description of how much of the different isotopes there are, ion, a charged particle eg Na+ or Cl-, 2,8,1, the electron configuration of the Alkali metal, sodium, 2,8,7, the electron configuration of the halogen, chlorine

Year 10 Atomic Structure

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