Electronegativity is just one of the things that we have talked about throughout this unit that goes along with chemical bonding. This number is placed on the periodic table and will tell you which elements have higher electronegativity than others. This number dictates the bonds they will make or whether or not the elements are non polar, polar, or ionic bonds.
When you look at the periodic table, the electronegativity values tend to increase as you go to the right and up. This pattern will help when you are asked to put several bonds in order from most to least ionic without using the values themselves.
Here is a link that helps explain electronegativity: http://www.chemteam.info/Bonding/Electroneg-Bond-Polarity.html
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