Chemistry > AQA A/As Level Question Paper > AQA GCSE Chemistry Topic 1- Atomic Structure 2025/2026Exam (All)

AQA GCSE Chemistry Topic 1- Atomic Structure 2025/2026Exam

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atom the smallest unit of matter element a substance made of only 1 type of atom molecule a substance made of two or more atoms joined together by a bond compound a substance made of at least two diff ... erent types of atom chemically bonded together mixture two or more substances that are mixed together but are not joined by bonds chemical symbol the letters on the periodic table that give the name of each element, every element has its own chemical symbol chemical formula the collection of chemical symbols that show how many of each element are present in a molecule or compound nucleus the centre part of an atom that contains the protons and neutrons proton sub-atomic particle that makes up the nucleus of an atom, has a mass of 1 and a charge of +1 neutron sub-atomic particle that makes up the nucleus of an atom, has a mass of 1 and a charge of 0 electron sub-atomic particle found orbiting the nucleus in an electron shell, has a mass of almost 0 and a charge of -1 ion an atom that has lost or gained electrons to become charged, lost electrons leave a positive ion, gained electrons leave a negative ion conservation of mass a rule that says you must have the same amount of atoms at the end of a chemical reaction as you started with chemical equation a way of showing what happens in a chemical reaction using the chemical symbols and formulae of the substances balanced equation a chemical equation written so that there are the same number of each type of atom on each side of the equation atomic nu [Show More]

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