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: Metal atoms transfer electrons to nonmetal atoms. Producing oppositely charged ions (cation & anion) which attract each other.
Na Cl  NaCl

6. Write an ionic formula for Na+ bonding with F−
Balance the charges.
Na F−
(1+) (1-) = 0
1 Na+ and 1 F− = NaF

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 O-2
Balance the charges.
Fe3+ O−2
Fe3+ O−2
O−2
2(3+) (2-) = 0
2 Fe3+ and 3 O−2 = Fe2O3

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

10. Write the formula for…
an ionic compound composed of:
Cd2+ and F-
CdF2

11. Write the formula for…
an ionic compound composed of:
Ag+ and O2-
Ag2O

12. PbBr2 Pb2+ and Br- an ionic compound composed of:
Write the formula for…
an ionic compound composed of:
Pb2+ and Br-
PbBr2

13. Hg3P2 Hg2+ and P3- an ionic compound composed of:
Write the formula for…
an ionic compound composed of:
Hg2+ and P3-
Hg3P2