which represents a group of elements with common characteristics

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copper, oxygen, silver

copper, gold, silver

silver iodine, helium

oxygen,hydrogen, lithium

Oct 21st, 2017

Oxygen, hydrogen, lithium

Mar 19th, 2015

are you sure??? 

Mar 19th, 2015

Sorry, copper, gold , silver is correct

Mar 19th, 2015

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Oct 21st, 2017
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Oct 21st, 2017
Oct 22nd, 2017
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