Source: Jennifer Roushar; Image from http://www.thesmarticleparticles.blogspot.com/
Source: Jennifer Roushar; Image from http://en.wikipedia.org/wiki/Electronegativity
Source: Jennifer Roushar; Images from http://www.chem.fsu.edu/chemlab/chm1050lmanual/halogens/background.html, http://chemistry-desk.blogspot.com/search/label/Chemical%20Bonding