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Chemistry 7 Online
OpenStudy (anonymous):

Helium (He), oxygen (O), carbon (C), and selenium (Se) are all nonmetals. Using the periodic table, which pair of these nonmetals has the most similar properties?

OpenStudy (aaronq):

if you look at the periodic table Se in the same period as O..

OpenStudy (mayankdevnani):

oxygen and selenium.

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