1. Polyatomic Compounds

2. What is a polyatomic ion?
Polyatomic ions: groups of atoms that tend to stay together and carry an overall ionic charge. See pg 202

3. Table of Common Polyatomic Ions
Name of polyatomic
ion
Ion fomula
Ionic Charge
Nitrate
NO3- -1
Hydroxide
OH-
Bicarbonate (hydrogen carbonate)
HCO3-
Chlorate
ClO3-
Carbonate
CO3-2 -2
Sulfate
SO4-2
Phosphate
PO4-3 -3
Ammonium
NH4+ +1

4. Polyatomic Compound Formulas
Formulas for polyatomic compounds is determined the same way as ionic compounds. Cation first, Anion second, cross over rule
Al+3 + CO3-2
Al2(CO3)3

5. Naming Polyatomic Compounds
Step 1: Write the name of the metal first.
Step 2: Write the name of the polyatomic ion second.
Step 3: Smile, you’re done!

6. Covalent Bonds

7. Review
Ionic bond: The force of the attraction between a Positively Charged Ion and a Negatively Charged Ion

9. Covalent Bond
Covalent Bonds: a bond formed by two or more non-metals atoms sharing one or more electrons

10. Differences between Ionic & Covalent bonds
Ionic Bonds
Covalent Bonds
Bond between metals and non-metals
Bond between non-metals
Metal loses its valence electrons to the non-metal
Atoms share their valence electrons
The atoms are held together by the attraction between (+) & (-)
The atoms are bonded by the shared electrons
(weaker)

11. Molecular Compounds
Molecular Compounds: a compound formed by the combination of two or more atoms held together by covalent bonds.

12. Covalent Bond for Chlorine

13. Diagrams

14. Naming Molecular Compounds
The prefixes:
Mono = 1
Di = 2
Tri = 3
Tetra = 4
Penta = 5

15. Naming continued To name a molecular compound:
Step 1: Write how many of each atom you have.
Step 2: Write the correct prefix (ex:mono,di,etc.) then the name of the element (same as on the periodic table)
Step 3: Write the prefix of the next element (with –ide on the end)
Note: There is no reducing!