Atom - The smallest particle of matter that can exist by itself, Molecule - Two or more atoms bonded together eg. H2, Compound - Two or more different types of atoms bonded together eg CO2, Pure element - Matter made of only one kind of atom eg. Ar, Mixture - Several different molecules or atoms mixed together but not chemically bonded eg. iron and sand in the same container, Electron - Negatively charged part of an atom that orbits around the outside, Proton - Positively charged part of an atom that is found in the middle, Neutron - Neutral part of an atom that is found in the middle, Mass Number - BIG number on the periodic table that tells you how many protons + neutrons an element has, Atomic Number - Small number on the periodic table that tells you how many protons an element has, Carbon dioxide gas - Colourless gas that makes flames go out and makes limewater go cloudy, Hydrogen gas - Colourless gas that makes a loud POP noise when you light it with a match, Oxygen gas - Colourless gas that makes a glowing piece of wood light up into a flame again, Solid - State of matter where all the particles are touching and don't move around, Liquid - State of matter where particles are touching but can still flow around, Gas - State of matter where particles move far apart from each other,

8 Sci - Chemical Free Chemistry

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