Electron Transitions & Emission Spectra — Drills · Grade 11 Science
Chapter: Atoms, Electrons & PeriodicityWhat these drills covers
By the end of Electron Transitions & Emission Spectra you should be able to:
- I can connect spectral lines to allowed electron energy changes.
- I can calculate photon energy and evaluate a pattern match.
2 questions, numeric and written answer, each with a worked explanation.
Vocabulary used: ground state, excited state, photon.
Problem 1
A level drops from 7 to 3 arbitrary energy units. How many units are released?
Hints
Write the relationship first; substitute with consistent units.
Answer and explanation
4 energy units
7−3 = 4.
Problem 2
Why does an element emit selected colors?
Answer and explanation
Only allowed state differences occur; each gives a photon with a specific frequency.
Response criteria
- State a scientifically accurate conclusion.
- Show the calculation or mechanism that supports it.
- Include units, conditions, or limits where relevant.