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Electronegativity and Polarity

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Electronegativity and Polarity

Pg. 61

- The measure of the tendency of an atom to except an electron
- Same trend as electronegativity
- The character and type of bond can be predicted by looking at the electronegativity values of each element

- Covalent compounds in which the atoms are the same share the electrons equally
- Covalent compounds in which the elements are different result in unequal sharing of electrons
- Creates a polar covalent bonds
- Use to show areas of partial negativity and to show areas of partial positivity.

- Molecules are either polar or nonpolar
- Polar molecules have a partial negative charge on one side and partial positive on the other.
- Called a dipole
- Symmetrical compounds are nonpolar

- 1. Consider each bond in the compound and use the symbols to determine if there is a positive end and a negative end
- 2. consider the shape of the molecule. If there is an end that is positive and an end that is negative it is polar
- Ex. CCl4, AlCl3, SiO2

- Use the compounds from page 60 and decide if each is polar or nonpolar