How do periodic trends in electronegativity relate to those for ionization energy and electron affinity?
Electronegativity increases as you go up a group and across the Table from left to right. Ionization energy follows the same basic trend, with a spike in IE seen when you hit a half-filled or completely-filled subshell. Electron affinity increases (becomes more negative) along these directions as well, with the half-filled and completely-filled subshell elements showing a significantly smaller amount of energy gain.
