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Periodic table
A table which shows all the elements arranged in rows and coloumns. Elements with similar properties are grouped together
Element
A pure substance made of only one kind of atom
Atom
Basic unit of matter
Compound
A group of two or more atoms strongly joined together
Metal qualities
Shiny, hard, malleable, good conductors of heat and electrictiy
Molecule
pure substances made from atoms of two or more elements chemically joined together
Chemical formula
A formula that shows the elements present in a compound and their relative proportions
Chemical symbol
The one or two letter code for elements used by scientists in all countries (e.g, Au=gold)
Group
Row of the periodic table
Period
A coloumn on the periodic table
Chemical reaction
A change in which a new substance is formed. Atoms are rearranged and join together differently