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  • Created by: JennD
  • Created on: 28-05-16 09:14
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  • Atom
    • Atoms and Elelements
      • The Nucleus
        • Contains protons and electrons
        • In middle of atom
        • Protons are positively charged and neutrons have no charge so the nucleus is positively charged
        • Very very small
      • The Electrons
        • Around the nucleus
        • Negatively charged
        • Occupy shells. These explain the periodic table
        • Cover lots of area
      • Atoms have no charge as the charge of the protons and electrons is the same and they are opposite the charges are cancelled out
      • Is the atoms gains or loses a protons or electron is becomes charged meaning it's a ion
    • Electron shells
      • Rules
        • Electrons always occupy shells
        • The shell closest to the atom must be filled first before you move onto the next shell
        • Only a certain number of electrons are allowed on each shell. 2-8-8 rule
        • Atoms behave better and react less if they have a full outer shell
          • Think noble gases. They are stable (unreactive)
        • If doesn't have full outer shell the atom will react to fill it
    • Elements
      • Elements only consist on 1 atom type
      • They can be found in the periodic table
        • It groups atoms of similar properties together
    • How to find out the number of protons, electrons and neutrons
      • On the periodic table you always have a mass number at the top and atomic number at the bottom
      • Mass number is the mass of the nucleus (the protons and electrons)
      • Atomic number tells you how many protons there are, which is the same as the number of electrons
        • Number of neutrons= atomic number-mass number
          • Mass number is the mass of the nucleus (the protons and electrons)


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