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Science · Grade 10

Atomic Structure and Evidence

Learners use atomic number and mass number to count the particles in atoms, ions and isotopes, follow the experimental evidence that forced the atomic model to change from Dalton to Bohr, calculate average atomic mass from isotope data, and connect electron energy levels to the line spectra that identify elements, even in distant stars.

  • 4 lessons
  • About 105 minutes
  • Atomic structure check: 10 questions
  • Ways to answer: fill in the blanks, choose an answer, match pairs, type a number, place on a number line and put in order
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What learners will discover

  • Describe protons, neutrons and electrons by charge, relative mass and location, and use atomic number, mass number and charge to count the particles in atoms and ions.
  • Explain how cathode-ray, gold-foil and spectral evidence led scientists to revise the atomic model.
  • Use isotope notation and calculate the average atomic mass of an element from isotope masses and abundances.
  • Relate electron energy levels to emission line spectra and write shell arrangements for elements 1–20.

Lessons

  1. Counting the particles in atoms and ions 6 steps4 practiceabout 25 min
  2. Evidence that changed the model 6 steps4 practiceabout 25 min
  3. Isotopes and average atomic mass 6 steps4 practiceabout 25 min
  4. Energy levels and line spectra 7 steps4 practiceabout 25 min
  5. Atomic structure check 10 questions at the end

Keep exploring

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Guide for grown-ups