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2.3 Pre-Class Lecture duration 5 minutes 57 seconds 2.3 Pre-Class Lecture 2.3 Pre-Class Lecture	2.3 Pre-Class Lecture things electrons idea chemistry probability principle uncertainty level wave side cloud properties waves particle physics nucleus thing behavior heisenberg velocity From Leena Nabulsi 0 likes 24 plays 0
1.3 Pre-Class Lecture duration 8 minutes 13 seconds 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