anion - an ion that has more electrons than protons and is negatively charged, atom - the fundamental building block of all materials consisting of a cluster of protons and neutrons surrounded by a cloud of electrons, atomic number - the number of protons in a nucleus; the atomic number determines what type of atom it is, atomic symbol - a short-hand notation for describing an atom; it consists of the chemical symbol, atomic number, and mass number, cation - an ion that has more protons than electrons and is positively charged, compound - a pure substance that is made up of two or more different types of atoms chemically joined, crystal lattice - a grid-like structure of atoms or ions in which each particle is bonded to all of its neighbouring atoms, electron - a small, negatively charged particle; clouds of electrons surround the nucleus of an atom, electron cloud - the region of negative charge surrounding the nucleus, containing the electrons, element - a substance made up of only one type of atom, ion - an atom that has gained or lost an electron, mass number - the number of protons and neutrons in an atom, molecule - two or more atoms (different or the same) chemically joined together making up an element or a compound, neutral - having no overall charge, neutron - a particle with no electric charge; it is found in the nucleus of an atom, nucleus - a cluster of neutrons and protons at the centre of an atom, proton - a positively charged particle found in the nucleus of an atom, subatomic particles - the smaller particles that atoms are made of-protons, neutrons, and electrons,

Unit 1 Glossary - Part 1: Atoms

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