Lesson 20

Getting Connected

Ionic Compounds

Metal elements combine with the nonmetal element chlorine to form compounds
Ionic compound - an ionic compound is a compound composed of positive & negative ions, formed when metal and nonmetal atoms combine
Rule for naming -         (+)           (-) 
                                   Metal    Nonmetal - ide
Li+1S2-                     Lithium    Sulfur - ide
Na+12O2-              Sodium   Oxygen - ide

Rule of zero charge - in ionic compounds, positive charges in cations and negative in anions sum to 0.

Practice Problems
3) Lithium nitride has the formula Li3N.
a. +1 but the three ions add up to +3
b. -3
c. Since the three lithium ions combine have a positive charge of three, when you add them to the nitrogen's negative charge of three it equals 0. (+3) + (-3) =0
d. each lithium atom has 0 valence electrons and the nitrogen atoms has 8 so it is full.

5) a. KBr - (+1) + (-1) =0 b. CaO - (+2) + (-2) =0 c. Li2O - 2(+1) + (-2)

d. CaCl2 - (+2) + 2(-1) =0 e. AlCl3 - (+3) + 3(-1) =0

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