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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