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http://www.chemguide.co.uk/atoms/structures/ionicstruct.html
http://www.princeton.edu/~achaney/tmve/wiki100k/docs/Ionic_bond.html
http://en.wikipedia.org/wiki/Ionic_bonding
http://ibchem.com/IB/ibnotes/swf/ionic.htm
https://www.nde-ed.org/EducationResources/CommunityCollege/Materials/Str...
http://snebulos.mit.edu/egoeke/iowalectures/chp4-handouts.pdf
http://www.knockhardy.org.uk/sci_htm_files/08sandb.pdf
http://ocw.uc3m.es/ciencia-e-oin/materials-science-and-engineering/lectu...
http://www.physics.uwo.ca/~lgonchar/courses/p2800/Chapter2_Bonding_Hando...
http://www.chem.fsu.edu/~zakarian/az_personal_web_cz/CHM1050_Chapter2_le...
http://www.roberts-publishers.com/media/loudon.1.pdf
http://www.unomaha.edu/tiskochem/Chem1140/Lecture_Handouts/Chapter6.pdf
