peruorbust2012 peruorbust2012

23-11-2016
Chemistry

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the elements carbon nitrogen and oxygen are all part of the same blank on the periodic table.

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HagerAlaa HagerAlaa

23-11-2016

in the same period number 2

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MollyCoyote MollyCoyote

23-11-2016

They are all part if the same period, period 2

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