1. Editorial 8 – Special Issue on the Periodic System of the Elements

   • Eric R. Scerri

   Editorial Commentary Pages: 97 - 104

2. Argon and the Periodic System: the Piece that Would not Fit

   • Carmen J. Giunta

   OriginalPaper Pages: 105 - 128

3. The First Subatomic Explanations of the Periodic System

   • Helge Kragh

   OriginalPaper Pages: 129 - 143

4. What and How Physics Contributes to Understanding the Periodic Law

   • V. N. Ostrovsky

   OriginalPaper Pages: 145 - 181

5. Bibilography of Secondary Sources on the Periodic System of the Chemical Elements

   • Eric R. Scerri
   • Jacob Edwards

   OriginalPaper Pages: 183 - 195