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Yr 9 Chem 1.1 &1.2

Atom the fundamental building block of all materials; it consists of a cluster of protons and neutrons surrounded by a cloud of electrons
Atomic model scientists’ representation of an atom determined by experiment and indirect observation
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
Compound a pure substance that is made up of two or more different types of atom chemically joined
Crystal lattice a grid-like structure of atoms or ions where 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 configuration the number of electrons in each of the electron shells of an atom
Electron shell part of the electron cloud; it is a layer that surrounds the nucleus and can only hold a certain number of electrons
Element a substance made up of only one type of atom
Isotopes atoms that have the same number of protons but a different number of neutrons in their nucleus
Mass number the number of protons and neutrons in an atom
Molecule a cluster of atoms that makes 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
Periodic table table showing all 118 known types of atoms (elements)
Proton a positively charged particle in the nucleus
Anion a negatively charged ion
Cation a positively charged ion
Ion an atom that has lost or gained electrons and therefore has an electric charge
Created by: camwust



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