Elements, Atoms and Compounds

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  • Elements, Atoms and Compounds
    • All materias are made up of one or more elements.
      • An element is a substance that cannot be broken down into other substances.
    • There are 92 elements that exist naturally.
      • Scientists have made a few more.
    • The Periodic Table lists all the elements.
      • Every element has its own chemical symbol.
    • Every element is made up of one type of atom. All the atoms of an element are the same.
      • An atom is the smallest part of an element that can exist.
    • The atoms of one element  are different to the atoms of all other elements.
    • The properties of a substance are the properties of many atoms, not just a single atom.
    • The properties of a compound are different to the properties of the elements that it is made from.
      • A compound is a substance made up of atoms of two or more elements, strongly joined together.
    • A molecule is a group of two or more atoms atoms that are strongly joined together.
    • A chemical formula shows the relative number of atoms of each element in a compound.

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