# Chemistry for Everyone! Let's start with common table salt. Sodium chloride has a chemical formula of NaCl. This compound is made from sodium (atomic number = 11) and chloride ions (atomic number = 17). To locate these ions, use:

# The key to the entire nomenclature is get to zero!

The sodium ion has a +1 charge and the chloride ion has a -1 charge.

# +1 - 1 = 0NaCl

Directly under sodium is the potassium ion, it also has a +1 charge. To form potassium chloride, we follow the same formula as above.

# +1 - 1 = 0KCl

To the right of potassium is the calcium ion, it has a +2 charge. To form calcium chloride, we need to get to zero by cancelling out one +2 calcium ion with two -1 chloride ions.

# +2 - 1 - 1 = 0CaCl2

Aluminum (atomic number = 13) has a +3 charge. To form aluminum chloride, we need to get to zero by cancelling out one +3 aluminum ion with three -1 chloride ions.

# +3 - 1 - 1 - 1 = 0AlCl3

Directly below the chloride ion in the Periodic Table of Ions is the bromide ion. Bromide has a -1 charge. Sodium bromide, potassium bromide, calcium bromide and aluminum bromide are found by similar methods outlined above. Namely, we need to get to zero!

# NaBrKBrCaBr2AlBr3

In the Periodic Table of Ions, the sulfide ion has a -2 charge. To form sodium sulfide, we need to get to zero by cancelling out two +1 sodium ions with one -2 sulfide ion.

# + 1 + 1 - 2 = 0Na2S

What about water? The chemical formula for water is H2O. The ion table lists hydrogen as a +1 and oxide as a -2. To get to zero, we need two +1 hydrogen ions and one -2 oxide ion!