Atoms, elements, and the periodic table | Khan Academy
https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atoms-elements-and-the-periodic-table
WEBQuiz. Unit test. About this unit. Are you ready to dive into the wonderful world of chemistry? In this unit, we'll cover some of chemistry's most fundamental topics, including atoms, isotopes, ions, and the periodic table. We’ll also explore different ways of representing atoms, such as through Bohr models and Lewis diagrams. Atomic structure.
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