Atoms, compounds, and ions | Chemistry library - Khan Academy
https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties
WEBScience. Chemistry library. Unit 1: Atoms, compounds, and ions. About this unit. This unit is part of the Chemistry library. Browse videos, articles, and exercises by topic. Introduction to the atom. Learn. Worked example: Atomic weight calculation. The mole and Avogadro's number. Ions and compounds. Learn. Molecules and compounds.
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