Atom - Tiny particles that everything is made from, Chemical change - A reaction that causes atoms to be rearranged to form new products – usually irreversible, Compound - A substance made of two or more atoms that are chemically bonded together, e.g. water (H2O), Element - A substance made up of only one type of atom, Gas - A state of matter when particles are not touching and can move freely, A group - The vertical parts of the periodic table – the elements in each group will share properties, e.g. group 7 are gases at room temperature, A period - These are the rows across the periodic table, Periodic table - A table that shows all of the elements we know of arranged according to their properties, A physical change - A change of state, e.g. solid to liquid (such as ice to water) - reversible, Reactive series - A reactivity series is when elements are put into order of how reactive they are, from most reactive to least reactive, Solid - A state of matter when particles touch each other and cannot move (they are in a fixed arrangement), A symbol - A letter or two letters given to each element on the Periodic Table. Each element has its own symbol, e.g. “O” for oxygen, “Na” for sodium, nobel gas - unreactice element in group 0, halogen - reactive non-metal in group 7, alkali metal - reactive metal in group 1, tarnish - when a metal has reacted with oxygen in the air and changed to a dull colour, inert - a substance that does not take part in chemical reactions, displacement - when a more reactive element displaces a less reactive element in a compound, metal oxide - alkali formed when metal combined with oxygen , non-metal oxide - acidic substance formed when a non-metal element is combined with oxygen, ore - a rock containing enough of an element to warrant extraction,

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