Fundamental

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  • Created by: Hannah
  • Created on: 06-12-12 18:50
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  • Fundamental ideas
    • Atoms
      • Each element is made of only one atom
      • Atoms have  a tiny nucleus surrounded by electrons
      • Compounds are formed when two or more elements combine together
    • Atomic Structure
      • The nucleus of an atom contains two types of particles
        • Protons
          • Have a positive charge
        • Neutrons
          • Has no charge
      • Electrons
        • Protons
          • Have a positive charge
        • Number of protons is equal to the number of electrons and their changes are equal and opposite
      • Atomic number of an element is equal to the number of protons in the nucleus of its atom
      • No of protons = atomic number
      • No of electrons = No of protons
        • No of protons = atomic number
      • No of neutrons = mass number -  atomic number
        • No of electrons = No of protons
      • Forming bonds
        • Compounds of metals bonded to non-metal have ionic bonds
        • The formula of an ionic compound shows the simplest ratio of ions
        • Compounds of non-metals have covalent bonds
        • The formula of a molecule shows the number of atoms in the molecule
      • Chemical  epuations
        • Atoms get re-arranged in chemical reactions
        • =The mass of the products is equal to the mass of reactants
        • Symbol equations should always be balanced
        • When symbol equations are written they should always be balanced

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