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08:13 1.3 Pre-Class Lecture 1.3 Pre-Class Lecture	1.3 Pre-Class Lecture protons electrons mass charge neutrons ions cat element cats identity thing pair islands symbols properties space cloud nucleus particles thursday From Leena Nabulsi 0 likes 35 plays 0
11:42 1.2 Pre-Class Lecture 1.2 Pre-Class Lecture	1.2 Pre-Class Lecture things electrons water mass experiment law atoms model composition thursday tuesday wednesday electron carbon oxygen atom structure ratios compounds protons From Leena Nabulsi 0 likes 36 plays 0