While there are many thousands of different chemical compounds there is a very definite system of nomenclature whereby we can name or write chemical formulas for. 1. Write the formulas for the binary ionic compounds formed between the following elements: a) potassium and iodine: ans d) aluminum and sulfur: ans Periodic Table Link: . The following episode looks at writing formulas for binary ionic compounds. We look at. The procedure that can be followed when confronted with the name of a compound and you wish to write its formula is as follows: Welcome to CAcT, ©cchieh@uwaterloo.ca Chemical Formulas Key concepts Chemical formulas: empirical formula, molecular formula, and structural formula A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound, using a single line [citation. Here's how to write formulas for binary ionic compounds. We'll see how you have to balance the charges of the two ions so they cancel each other out. Chemical formula help to balancing chemical equations. Worksheets with answers. Practice problems. Chemistry calculators, online chemistry quiz & fun chemistry games. Chemistry - How to write a balanced equation given the word equation, Practice with writing and balancing equations.