Atoms, Electrons & Periodicity — Chapter overview · Physical Science: Chemistry, Grade 11
Connect atomic evidence, isotopes, electron arrangements, spectra, and periodic patterns.
Chapter question
How does atomic structure explain chemical patterns?
Units in this chapter
- Unit 2.1 · Atomic Models & Subatomic Particles
I can trace how the model of the atom changed from Dalton through Thomson, Rutherford, Bohr, and the quantum-mechanical picture, and explain what experiment forced each revision.
- Unit 2.2 · Isotopes & Average Atomic Mass
I can define isotopes and explain why they share chemistry but differ in mass.
- Unit 2.3 · Electron Configuration
I can describe how electrons are organized into energy levels, sublevels (s, p, d, f), and orbitals.
- Unit 2.4 · The Periodic Table
I can explain how the periodic table is organized by atomic number into periods, groups, and s/p/d/f blocks.
- Unit 2.5 · Periodic Trends
I can describe how atomic radius, ionization energy, and electronegativity change across a period and down a group.
- Unit 2.6 · Electron Transitions & Emission Spectra
I can connect spectral lines to allowed electron energy changes.