what are electronegativity, electron affinity, and ionization energy?
The following are very brief summaries. See the references at the end for more details.
Electronegativity is a scale initially developed by Linus Pauling and modified by several others that describes the ease with which an atom attracts an electron. The electron affinity is the energy given off when an electron is added to an atom. The ionization energy is the energy required to move a particular electron completely away from an atom.
Here are some references for you to read.
http://en.wikipedia.org/wiki/Electronegativity
http://en.wikipedia.org/wiki/Electron_affinity
http://en.wikipedia.org/wiki/Ionization_energy