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The top documents tagged [atomic mass number slide]
James Ussher (mid 1600's) Georges Buffon (mid 1700s) Lord Kelvin (late 1800's) 75,000 yr 100 m.y. Charles Walcott (1893) 75 m.y. 4004 B.C
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Have 1 Periodic Table per group!. The mass number
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A. A. Why study chemistry? 1. 1. Chemistry 2. 2. Matter CHEMISTRY I. Introduction B. B. Definitions
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