Chemistry Definitions 0.0 / 5 ? ChemistryDefinitionsIGCSEEdexcel Created by: be.lla_wCreated on: 05-01-17 10:25 Diffusion The spreading out of one substance into another 1 of 24 Atomic no. BOTTOM - the number of protons = number of electrons 2 of 24 Mass no. TOP - the number of protons plus the number of neutrons 3 of 24 No. of outer shell electrons Group no. 4 of 24 No. of shells Period no. 5 of 24 Isotopes Atoms of the same element, which have the same no. of protons and electrons but a different no. of neutrons 6 of 24 Relative Atomic Mass The average mass of an atom compared to 1/12 of a Carbon-12 atom 7 of 24 Ram Equation (% x mass no.) + (% x mass no.) /100 8 of 24 Ion A charged atom which loses or gains electrons 9 of 24 Cation An atom which loses electrons to become a +ve ion 10 of 24 Anion An atom which gains electrons to become a -ve ion 11 of 24 Solid state symbol (s) 12 of 24 Liquid state symbol (l) 13 of 24 Gas state symbol (g) 14 of 24 Aqueos state symbol (aq) dissolved in water 15 of 24 Diatomic molecule A molecule that contains two atoms joined together of the same element 16 of 24 Ionic Bonding Metal + Non-Metal 17 of 24 Ionic Bond The strong force of attraction between two oppositely charged ions 18 of 24 Covalent Bonding Non-Metals Only 19 of 24 Covalent Bond The electrostatic force of attraction between a shared pair of electrons and the positive nuclei 20 of 24 Giant Metallic Structure Metals Only 21 of 24 Metallic Bond The force of attraction between the free moving outer electrons and the positively charged metal ions 22 of 24 Rate of Reaction Equation Amount of reactant used / Time 23 of 24 Activation Energy The MINIMUM amount of energy particles needed in order to collide successfully 24 of 24
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