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Understanding Polyatomic Compounds: Naming and Formulas

This guide focuses on polyatomic compounds, which are clusters of atoms that carry a net electric charge, typically negative. While it's not necessary to memorize their structures at this stage, knowing how to name them is essential. The document provides steps for naming compounds with metals and polyatoms, along with practice problems. It also introduces the only common positive polyatomic ion, ammonium, and explains how to derive chemical formulas for various compounds, including multivalent ions.

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Understanding Polyatomic Compounds: Naming and Formulas

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  1. Polyatomic Compounds

  2. 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. _____________________ Polyatomic Compounds You do not need to memorize these!!!!

  3. We will not be drawing the structures for these atoms at this time. However, we do need to be able to name them. Write the name of the metal (including the roman numeral if necessary) 2. 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 Compounds

  4. There is only one really common positive polyatomic ion, This polyatomic will form ionic compounds with non metals. To name these compounds, _________________ _________________ NH4+ _____________ NH4Cl __________________ (NH4)2O __________________ Polyatomic Exception

  5. Give the chemical formula for the following compounds Maganese (II) Sulphide Tin (IV) Flouride Copper (II) Phosphate Ammonium Sulphate __________________ __________________ __________________ __________________ Multivalent/Polyatomic Chemical Formula

  6. 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 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 Try: Copper (II) Nitrate

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