Atom, The smallest particle of an element that can exist on its own., Atomic Mass Unit, The mass of one proton or one neutron (shorthand amu)., Atomic Number, The number of protons in the nucleus of an atom., Chemical Property, The way a chemical reacts., Electron, Sub-atomic particle with a negative charge and negligible mass. Found outside the nucleus in electron shells., Electron Arrangement, The way electrons fill electron shells, Electron Shells, Area where electrons are orbiting., Element, A substance made up of only one type of atom., Group, A vertical column in the periodic table containing elements with similar chemical properties and the same number of outer shell electrons., Halogens, Reactive non-metal elements in group 7., Mass Number, The sum of protons and neutrons in the nucleus of an atom., Neutral, No overwhelming positive or negative charge., Neutron, Sub-atomic particle with no charge and mass of 1 amu. It is located in the nucleus., Nucleus, Positively charged centre of an atom containing protons and neutrons, Outer Electrons, Electrons located in the outer energy shell (furthest from the nucleus), Period, A horizontal row of elements in the periodic table., Physical Property, How a substance looks or behaves when not involved in a chemical reaction i.e melting and boiling point, colour or density., Proton, Sub atomic particle with a positive charge and mass of 1 amu. It is located in the nucleus., Stable, Has a full outer shell of electrons., Periodic Table, The table that lists all the elements in order of increasing atomic number, arranged into groups and periods..

Atomic Structure N5 Chemistry

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