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How many species do not exist? PH_(3),PH_(5),PCl_(5),PBr_(5),SiF_(6)^(2-),SF_(6),Al_(2)F_(6),PbI_(4),NCl_(5),AlCl_(3),OF_(2),OH_(2),OF_(4),HFO_(4),FeI_(3),B_(2)F_(6) [If your answer is 5 then write the answer as 0005.] |
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