Atoms Elements and Compounds 0.0 / 5 ? ChemistryAtoms and compoundsGCSEAQA Created by: eddieleeCreated on: 18-05-16 17:54 Mixtures can be separated into simpler substances 1 of 14 Compounds can be broken down into simpler compounds/elements 2 of 14 Elements cannot be broken down by chemical reactions 3 of 14 Sub Atomic Particles have a charge and a mass 4 of 14 Mass Number =protons + neutrons 5 of 14 Proton positive , RM; 1 6 of 14 Neutron neutral , RM; 1 7 of 14 Electron negative , RM; almost 0 8 of 14 First shell lowest energy, 2 electrons 9 of 14 Second shell next energy , 8 electrons 10 of 14 Third shell third energy, up to 18 electrons 11 of 14 Group number how many outer electrons 12 of 14 Outer electrons determine how the element reacts 13 of 14 Noble Gases unreactive, full outer shells 14 of 14
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