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Tomado de: https://www.google.com.co/url?sa=t&rct=j&q=&esrc=s&source=web&cd=8&cad=rja&uact=8&sqi=2&ved=0CDwQFjAH&url=https%3A%2F%2Falextecnoeso.files.wordpress.com%2F2012%2F01%2Ftema-3-estructura-atc3b3mica-de-la-materia-alumnos1.pdf&ei=OveKVYWSJsja-QHI_rfwDg&usg=AFQjCNFWmn70ZLDPf5GNzdkya6iqa2AqpQ&bvm=bv.96339352,d.cWw
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