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Chemistry

Learn · Chemistry Unit 1

Build it, then prove it

Every lesson opens like class — a no-notes Do Now — then one memory hook, an atom you can build and play with, and the teacher's own question formats. Seven lessons, about an hour in total.

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  1. 1Inside the atomThree particles, two numbers, one rule for neutral atoms. 7 min
  2. 2Nuclear notationRead it, write it, name it. 6 min
  3. 3Building the Bohr modelElectrons on energy levels, filled from the inside out. 9 min
  4. 4Core & valence electronsInside vs outermost. 6 min
  5. 5IsotopesSame element, different mass. 8 min
  6. 6Average atomic massA weighted average — the abundant isotope wins. 9 min
  7. 7Explain & evaluateThe long answers: error analysis and claim evaluation. 10 min