Chemistry Unit 1 Mindmap

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  • Created by: Chloe
  • Created on: 17-04-13 16:26
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  • Chemistry
    • Atomic structure
      • Atoms are made up of protons, neutrons and electrons
      • Protons and electrons have equal and opposite electrical charges. Protons are positively charged, and electrons are negatively charged.
      • Neutrons have no electrical charge. They are neutral.
      • Atomic number = number of protons (number of electrons.)
      • Mass number = number of protons and neutrons.
      • Atoms are arranged in the periodic table in order of their atomic number.
    • The arrangement of electrons in atoms
      • The electrons in an atom are arranges in energy levels or shells
      • Atoms with the same number of electrons in their outermost shell belong in the same group of the periodic table.
      • The arrangement of electrons in the outermost shell of an elements atom determines the way that element reacts
      • The atoms of the unreactive noble gases (in group 0) all have very stable arrangements of electrons.
    • Forming bonds
      • When atoms from different elements react together they make compounds. The formula of a compound shows the number and type of atoms that have bonded together to make that compound.
      • When metals react with non-metals, charged particles called ions are formed.
      • Metal atoms form positively charged atoms. Non-metals form negatively charged atoms. These oppositely charged ions attract each other in ionic bonding.
      • Atoms of non-metals bond to each other by sharing electrons.  This is called covalent bonding.
    • Chemical equations
      • As no new atoms are ever created or destroyed in a chemical reaction: total mass of reactants = total mass of products.
      • There is the same number of each type of atom in each side of a balanced symbol equation

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