30.1 Discovery of the Atom
https://cnx.org/contents/JydfSfIS:wKYIsSV1/30.1

30.2 Discovery of the Parts of the Atom: Electrons and Nuclei
https://cnx.org/contents/JydfSfIS:fsw4uvhV/30.2

30.5 Applications of Atomic Excitations and De-Excitations
https://cnx.org/contents/JydfSfIS:z6GcSqgz/30.5

30.6 The Wave Nature of Matter Causes Quantization
https://cnx.org/contents/JydfSfIS:rt2I8D90/30.6

30.7 Patterns in Spectra Reveal More Quantization
https://cnx.org/contents/JydfSfIS:_qlSPJPN/30.7

30.8 Quantum Numbers and Rules
https://cnx.org/contents/JydfSfIS:wfBXbxNm/30.8

30.9 The Pauli Exclusion Principle
https://cnx.org/contents/JydfSfIS:UGpL_FUi/30.9