Catalyst - Something that speeds up reactions by lowering the activation level, Element - A material with only one type of atom, Compound - 2 or more elements chemically bonded together, Mixture - 2 or more elements which can be separated without a reaction, Period - Row in the PTable (=number of electron shells), Group - Columns in the PTable (=number of free electrons), The person who created the PTable - Dmitri Mendeleev, How the periodic table is arranged - In order of the Atomic Number, Test for CO2   - Limewater turns milky, Test for Hydrogen (H2) - Lit splint produces a squeaky pop, Test for O2   - Glowing splint relights, Metals - Groups 1-3, plus Transitions and a few more, Non-Metals - Groups 7, 0, plus a few more elements, Atomic Number - Number of Protons , Mass Number (aka RAM) - Number of Protons + Neutrons, Ion - Charged particle, having transferred away or gained electrons, Number of Neutrons - Mass Number minus Atomic Number, Halogens - Group 7 elements, eg. F, Cl, Br, Earth Metals - Group 2 elements, eg. Be, Mg, Ca, Alkali Metals - Group 1 elements, eg. Li, Na, K, Noble Gases - Group 0 elements, eg. He, Ne, Ar, Transition Metals - Elements with varying valencies, eg. Cu, Fe, Zn, Isotope - Form of an element with different numbers of Neutrons, eg. C-12, C-14, Electronic configuration of Potassium - 2, 8, 8, 1 (19 electrons in 4 shells, group 1),

Chemistry GCSE Periodic Table

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