Reactions 2.0 / 5 based on 1 rating ? ChemistryEnergy of reactions/Exothermic and endothermic reactionsIGCSEEdexcel Created by: AmritaCreated on: 06-05-13 13:29 What is an ion? An ion is an atom or a group of atoms with a charge, either negative or positive 1 of 5 What is a molecule? It is a group of two or more atoms 2 of 5 What is h2o? Water 3 of 5 What is a displacement reaction? A displacement reaction is where a more reactive metal displaces a less reactive metal from a compound 4 of 5 What does the groups in the Periodic Table tell you? Groups tell you the number of electrons in the outer-shell 5 of 5
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