Atomic Structure and The Periodic Table

Atomic Structure and The Periodic Table

1. Atoms, Elements, Compounds and Mixtures

   • All substances are made of atoms. An atom is the smallest part of an element that can exist.
   • Elements are made of only one type of atom. A compound contains two or more types of elements which are chemically bonded together. A mixture contains two or more types of elements but unlike compounds, mixtures are not chemically bonded.
   • Equations can be used in the following way to summarise the reaction between two elements E.G: magnesium+oxygen-> magnesium oxide
   • separating mixtures
     • Filtration
     • Crystallisation
       • You can obtain salt crystals by filtering the water and then evaporating it.

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