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07:08 Unit 1 Exam Review Unit 1 Exam Review	Unit 1 Exam Review mass percent times isotope unit amu abundance ions isotopes equation table ion question cat percentages decimal guys charge proton videos From Leena Nabulsi 0 likes 29 plays 0
05:51 1.4 Pre-Class Lecture 1.4 Pre-Class Lecture	1.4 Pre-Class Lecture mass times figs table abundance sense sig decimal isotopes calculation point unit answer math decimals account form percentage night bar From Leena Nabulsi 0 likes 26 plays 0