1. Molecular Compounds
Mr. MacMillan

2. Naming Binary Ionic Compounds
There are two ways to identify a compound:
Chemical Name
Chemical Formula
IUPAC
International Union of Pure and Applied Chemistry
Binary Ionic Compounds
Compound composed of a metal cation and a non-metal anion

3. Rules for Naming
The first part of the name always identifies the positive ion, which is the metal cation. Thus, this part of the name is the name of the metal.
The second part of the name always identifies the negative ion, which is the non-metal anion. The name of the non-metal ion always ends with the suffix ide.

4. Blue – Metals
Teal – Non-metals
Light Purple - Metalloids

5. Examples Magnesium and Phosphorus Sodium and chlorine
Magnesium phosphide
Sodium and chlorine
Sodium chloride

6. Determining the Chemical Formula
Cross-over method
Identify the metal and non-metal
Write the symbols
Write the charges
Cross over the charges from top to bottom
Remove the charge
Simplify the numbers and remove the 1’s

7. Electron Dot Diagram and Bohr-Rutherford
Electron Dot (Only showing valence electrons)

8. Multivalent Metals
Metals that have more than one ion charge listed in the periodic table.
They can form different Ions depending on the chemical reaction
Examples: Copper, Lead, Tin, Iron

9. Ionic Compounds with Polyatomic Ions
An ion that is composed of more than one atom.
Ternary compound
A compound composed of three different elements
Most end in ite or ate

10. Molecular Compounds
Also known as covalent compounds, are usually composed of two or more different non-metals
Atoms share a pair of electrons to form a covalent bond
The stability is associated with a full outer energy level of electrons

11. Molecules
A neutral particle composed of two or more atoms joined together by covalent bonds
The term molecule is also used to describe two or more atoms of the same element.
H2 O2

12. Naming Binary Molecular Compounds
A compound composed of two non-metals joined by one or more covalent bonds.
Prefix
Number
Mono 1 Di 2
Tri 3
Tetra 4
Penta 5
Hexa 6
Hepta 7
Octa 8

13. How to Name Binary Compounds
Count the number of atoms of the first element in the chemical formula
Write the appropriate prefix followed by the name of the element (mono is never used for first element)
Count the number of atoms of the second element in the chemical formula
Write the appropriate prefix followed by the name of the element using the suffix ide. If the prefix ends with a or o, this letter is dropped before oxide

14. Your Turn CS2 CCl4 Si2 Br6 Answers Carbon disulfide
Carbon tetrachloride
Disilicon hexabromide

15. Writing Chemical Formulas
Write the chemical symbol of the 1st element
Determine the number of atoms of the 1st element based on the prefix.
Write the chemical symbol of the second element.
Determine the number of atoms of the 2nd element based on the prefix.
Write the chemical formula for the compound, using the appropriate subscripts.

16. Your Turn Answers NF3 SF2 P2 O6
Write the chemical formula for each binary molecular compound.
Nitrogen trifluoride
Sulfur difluoride
Diphosphorous hexoxide
Answers
NF3
SF2
P2 O6