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Thinking (Electro) Negatively. Making Sense page 139. Electronegativity values increase from left to right on a period and up a group. . Electronegativity Difference. The difference of electronegativity values (EV) of two atoms determines the type of bond is between them.

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thinking electro negatively

Thinking (Electro) Negatively

Making Sense page 139

electronegativity difference
Electronegativity Difference

The difference of electronegativity values (EV) of two atoms determines the type of bond is between them.

Type of bond EV difference

Nonpolar bond 0 to 0. 3

Polar bond 0.4 to 1.7

Ionic Bond 1.8 to 3.3

3 types of bonds
3 Types of Bonds

Bonded electrons are equally shared in a nonpolar covalent bond. It consists of nonmetals and there is no charge. Electronegativity difference is between 0 to 0.3.

Ex: Cl - Cl

slide5

2. A polar covalent bond consists of bonded electrons that are shared unequally between nonmetals. The electronegativity value difference is between 0.4 to 1.7 which results in partial charges.

Ex: HEV=2.10 ClEV=3.16 3.16-2.10 = 1.06

* Bonded electrons are pulled toward the chlorine atom.

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3. An ionic bond is when a nonmetal atom gains an electron(s) from a metal atom. The electronegativity value difference is between 1.8 to 3.3. The metal atom becomes a positive ion (caiton) and the nonmetal atom becomes a negative ion (anion).

Ex: NaEV= 0.93 ClEV = 3.16 3.16-0.93= 2.23

Na+Cl-

exercises page 139
Exercises page. 139

What is the electronegativity value difference and type of bond for the following?

  • C-S
  • Li-F
  • H-I
  • C-O
exercises page 141
Exercises page. 141

What is the electronegativity value difference and type of bond for the following?

  • C-S 2.55-2.58=0.03, nonpolar bond
  • Li-F 0.98-3.98=3.00, ionic bond
  • H-I 2.10-2.66=0.56, polar bond
  • C-O 2.55-3.44=0.89, polar bond
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