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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