aqueous solution - the mixture made by adding a soluble substance to water, atom - the smallest part of an element that can still be recognised as that element, atomic number - the number of protons (which equals the number of electrons) in an atom. It is sometimes called the proton number, balanced symbol equation - a symbol equation in which there are equal numbers of each type of atom on either side of the equation, biofuel - fuel made from animal or plant products, chromatography - the process whereby small amounts of dissolved substances are separated by running a solvent along a material such as absorbent paper, compound - a substance made when two or more elements are chemically bonded together, electron - a tiny particle with a negative charge. Electrons orbit the nucleus of atoms or ions in shells, electronic structure - a set of numbers to show the arrangement of electrons in their shells (or energy levels), element - a substance made up of only one type of atom. An element cannot be broken down chemically into any simpler substance, group - all the elements in the columns (labelled 1 to 7 and 0) in the periodic table, ion - a charged particle produced by the loss or gain of electrons, isotope - atoms that have the same number of protons but different number of neutrons, i.e., they have the same atomic number but different mass numbers, law of conservation of mass - the total mass of the products formed in a reaction is equal to the total mass of the reactants, mass number - the number of protons plus neutrons in the nucleus of an atom, neutron - a dense particle found in the nucleus of an atom. It is electrically neutral, carrying no charge, noble gases - the very unreactive gases found in Group 0 of the periodic table. Their atoms have very stable electronic structures, nucleus (of an atom) - the very small and dense central part of an atom that contains protons and neutrons, periodic table - an arrangement of elements in the order of their atomic numbers, forming groups and periods, product - a substance made as a result of a chemical reaction, proton - a tiny positive particle found inside the nucleus of an atom, reactant - a substance we start with before a chemical reaction takes place, shell - an area in an atom, around its nucleus, where electrons are found, state symbol - the abbreviations used in balanced symbol equations to show if reactants and products are solid (s), liquid (l), gas (g) or dissolved in water (aq), symbol equation - an equation that helps you see how much of each substance is involved in a chemical reaction by showing the chemical symbols and formulae of all the reactants and products involved, word equation - a way of describing what happens in a chemical reaction by showing the names of all reactants and the products they form,
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oxo.aqa.combSci - C1 glossary
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