Writing Ionic Compounds

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Presentation transcript:

Writing Ionic Compounds Tuesday, January 10th, 2017

Important Vocabulary Polyatomic Ions Chemical Name Chemical or Molecular Formula Superscript Subscript A covalently bonded group of atoms with a charge that act as one unit The name of a compound or molecule that identifies the elements in it A notation that shows what elements a compound, or molecule, contains & in what ratio those elements exist A number written above an element symbol (Ex. Cl1-) The number written below an element symbol (Ex. H2O)

Atoms form compounds to lower the energy of the atom. They do this by: 1. filling the outer orbitals 2. emptying the outer orbitals or 3. sharing electrons to ‘effectively’ Fill the outer orbitals

Ionic Compounds - ions held by ionic bond Two Types of Compounds - IONIC and MOLECULAR When two or more atoms fill or empty their valence shells by the donation or acceptance of electrons, the atoms are held together by ionic charges (+/-) and they form an ionic compound. The attractive force that holds them together is an ionic bond. Ionic Compounds - ions held by ionic bond ALL IONIC COMPOUNDS ARE NEUTRAL This means the sum of the charges of all ions involved must be zero (0)

Step #1- Cation symbol is written first, anion second Making Ionic Compounds = Writing ionic Formulas Step #1- Cation symbol is written first, anion second Step #2 – Find the charges of each Step #3 - Cross over and down! Step #4- Simplify if necessary OH- Cl- Fe+3 O-2 PO4-3 Ca+2 NH4+1 Na+1

Example #1 “The Cross Over & Down” Ca2+ Cl - Al3+ O2- Ca Cl 2 Al2 O 3

Mg2+ Na+ Cl- O2- MgO NaCl NaCl MgO Same Charges (SIMPLIFY) Example #2 2 2 2 2 NaCl MgO

“The Cross Over & Down” Polyatomic Ions Don’t Forget Parentheses! Example #3 “The Cross Over & Down” Polyatomic Ions Don’t Forget Parentheses! Al3+ CrO42- Al3+ CrO42- Al2 (CrO4) 3 Al2 CrO43

Manganese (IV) Sulfide Aluminum Bromide Ammonium Fluoride Practice Writing Ionic Compounds: Sodium Oxide Zinc Chloride Manganese (IV) Sulfide Aluminum Bromide Ammonium Fluoride Calcium Phosphate

Manganese (IV) Sulfide = MnS2 Aluminum Bromide = AlBr3 Practice Writing Ionic Compounds - ANSWERS Sodium Oxide = Na2O Zinc Chloride = ZnCl2 Manganese (IV) Sulfide = MnS2 Aluminum Bromide = AlBr3 Ammonium Fluoride = NH4F Calcium Phosphate = Ca3(PO4)2