which represents a group of elements with common characteristics

Physics
Tutor: None Selected Time limit: 1 Day

copper, oxygen, silver

copper, gold, silver

silver iodine, helium

oxygen,hydrogen, lithium

Mar 19th, 2015

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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Mar 19th, 2015
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Mar 19th, 2015
Dec 8th, 2016
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