1. Turning chemistry into algebra
Ionic Formulas
Turning chemistry into algebra

2. REVIEW
We can tell how many electrons an atom will gain or lose by looking at its valence electrons.
Metals like to lose electrons. (Cations)
Ex. Na +
Nonmetals like to gain electrons. (Anions)
Ex: O 2-
All elements try to have a full valence of 8 electrons(OCTET RULE).

3. Chemical Bonding
A chemical bond is the force of attraction that holds two atoms together. Cl Na
Attractive Force

4. Why do elements form chemical bonds?
Atoms form chemical bonds in order to fill their outermost energy level with electrons.
A full valence causes an atom to be more stable.
A full valence consists of 8 valence electrons.

5. Ionic Bonding
Ionic bonds: Transfer of electrons from one atom to another, producing oppositely charged ions which attract each other.
(usually transfer from metal to nonmetal)
Na Cl  NaCl

6. How do we figure out what can bond with what?
1. Make sure to have cation + anion
2. Balance the charges.
Na F−
(1+) (1-) = 0
1 Na+ and 1 F− = NaF
NaF is the correct chemical formula for these two elements

7. Write an ionic formula for K+ bonding with S2−
Balance the charges.
K S2− K+
2(1+) (2-) = 0
2 K+ and 1 S2− = K2S

8. Write an ionic formula for Fe3+ bonding with OH−
Balance the charges.
Fe3+ OH−
OH−
(3+) (1-) = 0
1 Fe3+ and 3 OH− = Fe(OH)3

9. Al2S3 Al3+ and S2- an ionic compound composed of:
Write the formula for…
an ionic compound composed of:
Al3+ and S2-
Al2S3

10. Cd(NO2)2 Cd2+ and NO2- an ionic compound composed of:
Write the formula for…
an ionic compound composed of:
Cd2+ and NO2-
Cd(NO2)2

11. Ag2CO3 Ag+ and CO32- an ionic compound composed of:
Write the formula for…
an ionic compound composed of:
Ag+ and CO32-
Ag2CO3

12. Pb(NO3)2 Pb2+ and NO3- an ionic compound composed of:
Write the formula for…
an ionic compound composed of:
Pb2+ and NO3-
Pb(NO3)2

13. Hg3(PO4)2 Hg2+ and PO43- an ionic compound composed of:
Write the formula for…
an ionic compound composed of:
Hg2+ and PO43-
Hg3(PO4)2

14. Naming Ions
and ionic formulas

15. Naming Cations
Cation- if the charge is always the same (Group A) just write the name of the metal.
Transition metals can have more than one charge, so indicate the charge with roman numerals in parentheses.

16. Naming Cations Name the following: Na+ Fe+2 Fe+3 Pb+2 iron (II)
sodium
iron (II)
iron (III)
lead (II)

17. Naming Cations Write formulas for the following: Potassium ion K+
Copper (II) ion
Cu2+
Barium ion
Ba2+
Mercury (II) ion
Hg2+

18. Naming Anions
Anions are always the same, change the element ending to – ide
F-1 Fluorine

19. Naming Anions
Anions are always the same, change the element ending to – ide
F-1 Fluoride

20. Naming Anions Name the following: Cl- N-3 Br- O-2 chloride nitride
bromide
oxide

21. Naming Anions Write formulas for the following: sulfide ion S2-
iodide ion I-
phosphide ion
P3-
fluoride ion F-

22. Naming Ionic Compounds
Cation + Anion.
To write the names just name the two ions.
NaCl = Na+ Cl- = sodium chloride
MgBr2 = Mg+2 Br- = magnesium bromide

23. Naming Ionic Compounds
Write the name of CuO
Need the charge of Cu, O is -2
copper must be +2
Copper (II) oxide

24. Naming Ionic Compounds
Write the names of the following
KCl
potassium chloride
Na3N
sodium nitride
PbO
lead (II) oxide
PbO2
lead (IV) oxide