Physics · Grades 10–12
Atomic models and photon energy · Revision sheet
Distinguish nuclei, electron energy levels and the scope of simple models.
Learn the idea
Atomic structure
A nucleus contains protons and, except for ordinary hydrogen, neutrons; electrons occupy states outside it.
Energy levels
Simple atomic models use discrete energy differences. Transitions can involve absorption or emission of photons.
Photon energy
Photon energy is Planck's constant times frequency. Higher frequency means greater energy per photon.
Model caution
Orbit sketches are teaching representations, not literal miniature planetary tracks for all electrons.
Explain without looking
- An atom has 11 protons and 10 electrons. Find its net charge in units of the positive elementary charge.
- Does a brighter beam necessarily mean greater energy for each photon?
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Independent educational review required. Grade bands are approximate; these are not officially aligned curricula.