Chemical Bonds

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

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

Ionic Bonds Cl - Na +

Ionic Bonds Cl- Cl- Na+ Na+ Cl- Cl- Na+ Na+ Cl- Cl- Na+ Na+ Cl- Cl-

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

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

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

Covalent Bonds O H H H H

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

Covalent Bonds Single Bond Double Bond Triple Bond

Covalent Bonds – Lewis Structures H H H H

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

http://www.youtube.com/watch?v=QqjcCvzWwww

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?