Atomic Structure and the Periodic Table

  • Created by: Gaynor
  • Created on: 19-03-18 17:31
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  • Atomic Structure and the Periodic Table
    • Atoms, Elements and Compounds
      • All substances are made up of atoms
      • An atom is the smallest part of an element
      • There are about 100 different elements
      • Compounds are formed from elements via chemical reactions and can only be separated by chemical reactions
    • Mixtures
      • A mixture consists of two or more elements or compounds not chemical bonded together
      • Mixtures can be separated by a physical process like filtration or distillation
    • The Development of the Atom
      • Before the discovery of the electron, it was thought that the atom was a tiny sphere that could not divide
      • The discovery of the electron led to the plum pudding model that suggested atoms were balls of positive charge with negative electrons inside
      • The alpha particle scattering experiment led to the conclusion that mass of an atom was concentrated in the centre and the nucleus was charged - the nuclear model
      • Niels Bohr adapted the model suggesting electrons orbit the nucleus
    • Size and Mass of Atoms
      • Proton - +1 Neutron - 0 Electron - -1
      • Proton - 1 Neutron - 1 Electron - Very Small
    • The Periodic Table
      • The elements in the periodic table are arranged in order of atomic number so elements with similar properties are in the same groups
      • Elements in the same group have the same number of electrons on their outer shell
    • Metals and Non-Metals
      • Elements that react to form positive ions are metals - most elements
      • Elements that don't form positive ions are non-metals
    • Group 0 (Noble Gases)
      • They are unreactive and do not form molecules because of there full outer shell

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This is directly from the New AQA GCSE Specification for 9-1 Examinations starting 2018

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