E.1 Structure of the atom

Objective notes

6 learning objectives

—E.1.1—Rutherford experiment

• Geiger-Marsden-Rutherford experiment and the discovery of the nucleus.

—E.1.2—Nuclear notation

• Use nuclear notation: A = nucleon number, Z = proton number, X = element symbol.

—E.1.3—Atomic energy levels

• Emission and absorption spectra provide evidence for discrete atomic energy levels.

—E.1.4—Atomic transitions

• Photons are emitted/absorbed during transitions between atomic energy levels.

—E.1.5—Photon energy

• Photon energy in atomic transition: E=hf.

—E.1.6—Spectra and composition

• Use emission and absorption spectra to infer chemical composition.