Elements and the periodic table

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11 Terms

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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

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Element

A pure substance made of only one kind of atom

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Atom

Basic unit of matter

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Compound

A group of two or more atoms strongly joined together

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Metal qualities

Shiny, hard, malleable, good conductors of heat and electrictiy

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Molecule

pure substances made from atoms of two or more elements chemically joined together

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Chemical formula

A formula that shows the elements present in a compound and their relative proportions

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Chemical symbol

The one or two letter code for elements used by scientists in all countries (e.g, Au=gold)

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Group

Row of the periodic table

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Period

A coloumn on the periodic table

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Chemical reaction

A change in which a new substance is formed. Atoms are rearranged and join together differently