About this book ; User's guide ; Part I: Filling the 1s orbital. Hydrogen and helium ; Part II: Filling the 2s and 2p orbitals. The first short period: lithium to neon ; Part III: Filling the 3s and 3p orbitals. The second short period: sodium to argon ; Part IV: Filling the 4s, 3d, and 4p orbitals. The first long period: potassium to krypton ; Part V: Filling the 5s, 4d, and 5p orbitals. The second long period: rubidium to xenon ; Part VI: Filling the 6s, 5d, 4f and 6p orbitals. The third long period: caesium to radium ; Part VII: Filling the 7s, 6d, 5f and ... orbitals. The fourth long period: francium to ... ; Index
