Writing Formula's

 

Binary Compounds-metal to metal-ionic bonds

 

1-     Write the name for the first element

2-     Write the name of the second element

3- Add the ending "ide" to the root

 

Examples:

 

chlorine--- chloride. nitrogen---nitride oxygen---oxide

 

Name the compound AIF₃

 

Aluminum Flouride

 

Name the compound CaO

 

Calcuim Oxide

 

Binary Molecular Compounds- these are two nonmetals together-covalent bonds

 

Use prefixes - tell how many atoms of each element are present in each molecule

 

mono- 1             di - 2                tri - 3

 

tetra- 4             penta - 5          hexa- 6

 

hepta- 7             octa- 8             nona- 9

 

deca- 10

 

Use the prefixes to tell the subscript of the nonmetals in all formula's

Names of all binary compounds end with the "ide"

 

Examples

 

Name the compound CO

 

Name the compound N₂0₅

 

Carbon monoxide

 

Dinitrogen pentoxide

 

Name the compound CO₂

 

Carbon dioxide

 

 

Transitional elements

 

1- When naming transitional elements, roman numerals will be used.

2- First find the oxidation numbers for each element

3- Then write the elements name and roman numeral

4- Finish the name with the second element and follow the rules for that element.

 

Example:

 

Name the compound CoI2     Co2+ 11­

 

Name.the compound Cu2Se   Cu1+ Se2­

 

Coba1t(II) Iodide

 

Copper(I) selenide

 

Polyatomic Ions:

 

Metal combined with a Polyatomic Ion:

 

 

1- Use your textbook or tables available to locate the polyatomic ion. 2- Name the metal

3- Name the polyatomic ion

 

Name the compound NaOH

 

Sodium Hydroxide

 

Two Polyatomic Ions

 

1- Name the 1^st polyatomic ion

2- Name the 2^nd polyatomic ion

 

Name the compound NH₄NO₃

 

Ammonium nitrate

 

Binary Compound with hydrogen

 

1- add "hydro" to beginning of element

2- add the root of the nonmetal element plus ic

3- add "acid" to the end