The Student Room Group

GCSE Chemistry Structures

How do I know if something is an ionic compound/ giant covalent etc.? And which types of structures do I need to know for GCSE?
For GCSE (AQA) you need to know the following: Giant Ionic Lattices, Giant Covalent Structure, Simple Covalent Compound and the structure of a Metal !!

(Giant) Ionic Lattices - will consist of a metal AND non-metal e.g Sodium Chloride, Magnesium Oxide etc.
Giant Covalent Structure - Graphite, Graphene (thin sheet of graphite), Diamond and Silicon Dioxide
Simple Covalent Structure - will consist of non-metal AND non-metal (usually dot + cross diagrams) e.g carbon dioxide or water etc.
Structure of Metal - just positively charged metal ions surrrounded by a sea of delocalised electrons e.g Magnesium, Aluminium etc.
well, we know ionic compounds involves the bonding of a metal and a non-metal.covalent involves the bonding of 2 non metals. So say for example you have magnesium oxide, you should refer to your periodic table and see that magnesium is a metal and oxygen is a non metal. therefore magnesium oxide is an ionic compound.hope this helps:smile:

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