Periodic Trends
4 best study notes in Periodic Trends

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Chemistry - Electron Configurations
different electron configurations for chemistry; examples included


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Chemistry - The Chemistry of Life
This talks about the properties of matter, classifications of matter, states of matter and atomic bonding.

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Chemistry - Chemistry Unit 2: Atomic Theory and the Periodic Table
An overview of the theory behind atoms and the connection it has within the periodic table of elements

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Chemistry - Periodic table and trends
about the various groupings in the periodic table