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Polyatomic Compounds

Polyatomic Compounds Groups of atoms that can be found as parts of a molecule. These atoms bond in such a way that they have a net electric charge (usually negative) Here are some of the most common polyatomics. _____________________

You do not need to memorize these!!!!

Polyatomic Compounds We will not be drawing the structures for these atoms at this time. However, we do need to be able to name them. 1. Write the name of the metal


(including the roman numeral if necessary) Write the name of the polyatomic

Note: For a polyatomic, you do not need to change the ending of the molecule to - ide.

Name the following Ca3(PO4)2 __________________ CuSO4 __________________ BeCO3 __________________

Polyatomic Exception There is only one really common positive polyatomic ion, This polyatomic will form ionic compounds with non metals.

NH4+ ďƒ _____________

To name these compounds, 1. _________________

(NH4)2O __________________

2. _________________

NH4Cl __________________

Multivalent/Polyatomic Chemical Formula Give the chemical formula for the following compounds Maganese (II) Sulphide


Tin (IV) Flouride


Copper (II) Phosphate Ammonium Sulphate

__________________ __________________

e.g. 1/ What is the chemical formula of sodium phosphate? Step 1 – Write the symbols of each ion, beginning with the cation (metal) Na PO4 Step 2 – Write the ionic charge above each +1 -3 Na PO4

Try: Copper (II) Nitrate

Step 3 – Cross the charge to the oppose ions subscript +1 -3 Na PO4 Step 4 – Re-write the formula. Make sure you put brackets around the polyatomic ion if it has gained a new subscript!

= Na3PO4


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