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Chemistry 21 Online
OpenStudy (anonymous):

Which selection contains elements that are all in the same period? Rb, Sr, La, Zr Al, Ga, Si, P N, O, Cl, Br Hg, Tl, Pb, Bi

OpenStudy (anonymous):

http://en.wikipedia.org/wiki/Period_%28periodic_table%29 -check

OpenStudy (anonymous):

Hg, Tl, Pb, Bi !!! Thank you

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