Bonding ===>Bonds and Electronegativity

Three types of Bonds

1.Ionic (Metal)-Nonmetal)

• e- are transferred from metal to non-metal

2.Covalent (Non-metal ==> nonmetal)

• e-  are shared between non-metals

3. Metallic (Metal)
Holds pure metals together by electrostatic attraction

A) Electronegativity:
Electronegativity (en) is a measure of an atom's attractions for electrons in a bond

• Fluorine = 4.0 (the most en)
• Chlorine = 3.0
• Cesium = 0.8

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• Atoms with greater en attracts e- more. 
• Polar Covalent: Bonds form from an unequal sharing of e- (H2O) 
• Non-Polar Covalent: Bonds  form from equal sharing

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B) Bonds
The type of bond formed can be predicated by looking at the difference in Electronegativity(en) of elements.
  en > 1.7 = Ionic Bonds
  en < 1.7 = Polar Covalent
  en = 0 is non polar 

< = Less than
> = Greater than