C1 topic 1

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  • Created by: 04bbanks
  • Created on: 02-05-15 17:26
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  • C1 REVISION Topic 1
    • 1.3 Atoms,  elements & Compounds
      • Electrons occupy the lowest energy levels first
      • All elements in the same group of the periodic table have the same number of electrons in their highest  Energy level (outer shell)
      • Electrons in the lowest energy level are in the shell closest to the nucleus
      • The atoms of the unreactive noble gases(group 0) all have very stable arrangements of electons
      • Electrons in atoms are in energy levels that can be represented by shells
    • 1.2 Atomic Structure
      • Nucleus of An Atom is made up of protons and Neutrons
      • Protons +1    Neutrons 0    Electrons -1
      • Atomic N0.(Proton NO,) Of and element is equal to the number of protons in the nucleus of an atom
      • Elements are arranged in order of their atomic numbers in the periodic table
      • The mass number is the sum of the protons and neutrons in the nucleus of an atom
    • Forming Bonds
      • Compounds of metals bonded to non-metals 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
    • 1.1 The Arrangement of electrons in atoms
      • All substances are made of Atoms
      • Elements are made of only one type of atom
      • Chemical Symbols are used to represent Atoms
      • Compounds contain more than one element
    • 1.5 Chemical Equations
      • 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

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