The answer is "Liquid".
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Explanation:
the best way to understand the age of the earth is to estimate the age of matirials in it
The atoms didn't change we only added 2 different ones together. 2nd one is right
CIO4-=-1
CI=4O=-1
O has a 2- oxidation change so
CI+4(-2)=-1
CI+(-8)=-1
CI=-1+8=7
So the oxidation number of chlorine is 7 in this case
