1. Chemical Bonds

2. Chemical Bonds
An attractive force that holds atoms together in a compound
Two Main Classes
Ionic Bonds
Covalent Bonds

3. Ionic Bonds
A chemical bond of electrostatic attraction between negative and positive ions
One atom loses one (or more) electron(s); one atom gains one (or more) electron(s)
Resulting oppositely charged ions attract

4. Ionic Bonds Cl - Na +

5. Ionic Bonds Cl- Cl- Na+ Na+ Cl- Cl- Na+ Na+ Cl- Cl- Na+ Na+ Cl- Cl-

6. Ionic Bonds Characteristics Between Metal and Nonmetal
Form crystalline structures
Arranged geometrically
Ionic solids can be dissolved in
water
Can conduct electricity

7. Ionic Bonds – Lewis Structure
[ Na ]+ [ Cl ]-

8. Covalent Bonds Cooperative use of valence electrons
A chemical bond formed by the sharing of one (or more) pair(s) of electrons
Two neutral atoms share electrons
Held together by attraction of nuclei to opposite atoms' electrons

9. Covalent Bonds O H H H H

10. Covalent Bonds Characteristics Between two nonmetals
Form covalent compounds
Can also form between multiple pairs of electrons on only two atoms
Double Bond
2 electron pairs shared between 2 atoms
Triple Bond
3 electron pairs shared between 2 atoms

11. Covalent Bonds
Single Bond
Double Bond
Triple Bond

12. Covalent Bonds – Lewis StructuresH H H H

13. Covalent Bonds – Lewis Strucutres
Double Bond
O C O
Triple Bond
N N

15. Chemical Bonds – Quick Recap
1. For ionic bonds, how do the ions form?
2. Can two atoms of the same element form an ionic bond?
3. Can two atoms of the same element form a covalent bond?