Electronic Structure of Atoms and the Periodic Table

1. Electronic structure
   1. Orbital structure of hydrogen atom, principal quantum number (n), number of electrons per orbital
   2. Ground state, excited state
   3. Conventional notation for electronic structure

2. Classification of elements and chemical properties of groups and rows
   1. Valence electrons of the common groups
   2. First and second ionization energies and trends
   3. Electron affinity
      1. Variation of properties within groups and rows
   4. Electronegativity