Chemistry explained: every letsBug chemistry post

Atoms, electron shells and mixtures explained step by step, with diagrams. Each post goes with a letsBug video and ends with practice questions.

1. What Is Inside an Atom? Protons, Neutrons and Electrons: What is inside an atom? Protons, neutrons and electrons: their charges and masses, atomic and mass number, isotopes and electron shells.
2. Why Are Noble Gases Unreactive? Electron Shells Explained: Why are noble gases unreactive? A full outer shell. Plus the electronic configuration of the first 20 elements in one clear table.
3. Is Air a Mixture or a Compound? Separating Mixtures: Is air a mixture or a compound? A mixture: its gases aren't chemically combined. Learn filtration, distillation and chromatography, with Rf values.

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