BELLWORK 11/29/16 All metals _______ electrons, and have a ________ charge. All non-metals ________ electrons, and have a ________ charge.

WRITING IONIC FORMULAS

Label these charges on your Periodic Table Cations and Anions Label these charges on your Periodic Table +1 +2 +3 -3 -2 -1 Skip transition Metals Skip

Writing Binary Ionic Compound Formulas A Binary Ionic Compounds is composed of two elements. Ionic Compounds have to have an overall neutral (zero) charge. In order to achieve this, we must balance the charges on the cation and the anion to make sure the resulting compound formed has a neutral charge.

Example #1 What is the overall charge on the Ionic Compound formed between these two atoms? Na+1 and Cl-1

Example #2 What is the overall charge on the Ionic Compound formed between these two atoms? Mg+2 and O-2

Example #3 What is the overall charge on the Ionic Compound formed between Mg+2 and Cl-1 Since this compound has an overall positive charge, we need to balance the positive and negative charges. We use subscripts and multiply them by the charge to achieve an overall charge of of zero.

Example #4 What is the overall charge on the Ionic Compound formed between Ca+2 and P-3 Since this compound has an overall negative charge, we need to balance the charges

Writing Neutral Ionic Formulas Sodium chloride Metal Non-metal Na Cl Identify the chemicals as either a metal, transitional metal or non-metal Write out the chemical symbols of each

Na Cl NaCl sodium chloride + 1 - 1 + 1 - 1 metal non-metal 1. Identify the metal and non-metal 2. Write the symbols Write the charges Swap-n-drop the charges and write them as subscripts. A subscript of 1 is understood, and not written. NaCl

metal non-metal Calcium oxide + 2 - 2 Ca O + 2 - 2 1 1 CaO

metal non-metal magnesium chloride + 2 - 1 Mg Cl - 1 + 2 MgCl2

metal non-metal calcium phosphide + 2 - 3 Ca P - 3 + 2 Ca3P2

PRACTICE QUESTIONS Beryllium fluoride Barium bromide Sodium nitride Gallium sulfide Calcium sulfide Zinc bromide Aluminum chloride Cesium phosphide Lithium phosphide Germanium oxide BeF2 BaBr2 Na3N Ga2S3 CaS ZnBr2 AlCl3 Cs3P Li3P GeO2

Writing Ionic Formulas Using Transitional Metals

Sometimes, the metal in your Ionic Compound is a Transitional Metal ( A metal found in group 3-12 on the periodic table). When your metal is a transitional metal, it will be listed in the Left Column under Common Ions on your Chemistry Reference Page

How is A Transitional Metal Different from a Main group Metal? A transitional metal can have more than one charge. If we have a transition metal the charge will be shown in parentheses after the element name.

Examples: 1. Copper (II) and Bromine 2. Iron (II) and Oxygen 3. Lead (II) and chlorine 4. Mercury (II) and sulfur 5. Tin (II) and Fluorine 6. Iron (III) and Oxygen

BELLWORK 11/28/16 WHAT CHARGE DOES HYDROGEN HAVE? Ex: HBr - cation NaH - anion

Writing Ternary Ionic Formulas using Polyatomic Ions

Polyatomic Ions – Acts as the non-metal in an Ionic Compound Sometimes a group of atoms are chemically bonded, and act as one anion with a negative charge. A list of Polyatomic ions is listed in the two right-hand columns on your Chemistry Reference Page under Common Ions. Exceptions: There are 2 polyatomic ions that have a positive charge. (NH4+(ammonium and Hg22+ (dimercury)

Examples: Potassium sulfate- Lithium Nitrate – Copper (I) sulfate –

ANSWERS K+SO42-  K2SO4 Li+NO3-  LiNO3 Cu+SO42-  Cu2SO4

Homework Ch. 6 Worksheet #2