Chemistry 1 - A

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Atoms and elements
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Chemistry 1 - A
  1. Atoms
    1. ATOMS are small units of matter that can take place in chemical reactions
      1. Atoms have the same number of electrons as protons
        1. Proton = Electron
          1. They have no overall charge so are NEUTRAL
            1. If electrons are added or removed, the atom becomes CHARGED and is then an ION
        2. Two or more atoms make a MOLECULE
        3. Element
          1. An ELEMENT is a substance made up of just one type of atom
            1. When an element reacts with another element, a COMPOUND is formed
              1. Element + Element = Compound
                1. COVALENT BOND
                  1. IONIC BOND
                    1. METALLIC BOND
                    2. If two or more elements are not joined together, this is called a MIXTURE
                    3. Each element has atoms with different amount of protons
                    4. Structure of the atom
                      1. The middle of the atom is called the NUCLEUS
                        1. In the nucleus there are PROTONS and NEUTRONS
                          1. PROTONS are positively charged
                            1. NEUTRONS have no charge
                              1. SO the nucleus has an overall positive charge
                            2. The ELECTRONS move around the nucleus
                              1. ELECTRONS are negatively charged
                                1. They occupy shells around the nucleus
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