Which chemistry course should I pick if I have no prior knowledge?
I went to the Chemistry library (https://www.khanacademy.org/science/chemistry) and started with the first unit Atoms, compounds, and ions (https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties), but the exercise Predict the charge on monatomic ions (https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties/names-and-formulas-of-ionic-compounds/e/predict-charges-on-monatomic-ions) talks about 'valence electrons' and those weren't mentioned in any earlier lessons.
Should I pick a different course as a beginner?
Thank you very much!
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