Chemistry unit 1.1 key words 0.0 / 5 ? Chemistryfundamental ideasGCSEAQA Created by: frankie306Created on: 30-03-15 20:54 Atom The smallest part of an element which can still be recognised as an element 1 of 15 Solid, gas, liquid A state of matter 2 of 15 Periodic table An arrangement of elements in order of their atomic numbers forming groups and periods 3 of 15 Groups in the periodic table All elements in each column down the periodic table 4 of 15 Compound A substance made when two or more elements are chemically bonded together 5 of 15 Proton A tiny positive particle found in the nucleus of an atom 6 of 15 Neutron A dense particle found in the nucleus of no charge 7 of 15 Electron Tiny particle with negative charge that orbit the nucleus in shells 8 of 15 Atomic number The number of protons in an atom (top number) 9 of 15 Mass number Number of protons and neutrons in an atom (bottom number) 10 of 15 Electronic structure Writting down the number of electrons in each energy level 11 of 15 Ionic bonds The electrostatic force of attraction between two oppositely charged ions 12 of 15 Covalent bonds Chemical bonding through a pair of shared electrons with no new ions formed 13 of 15 Products New substances made in a reaction 14 of 15 Reactants Substances we start with in a reaction 15 of 15
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