Naming Ionic Compounds

Chemical reactions occur when atoms gain, lose, or share electrons. Metals Nonmetals Nonmetals _____________ electrons. This gives them a ____ charge. Negative ions are called ___________. gain / accept _ anions Metals ________________ electrons. This gives them a ____ charge. Positive ions are called ___________. lose / donate + cations

Look for the Roman Numeral! Remember that the charge of an ion can be determined by its place on the Periodic Table. +1 +4 or -4 +2 +3 -3 -2 -1 Look for the Roman Numeral!

For each elements on your notes, predict the charge of its most common ion using the periodic table. -3 +2 +2 -1 +1 +2 -1 -2 +1 -1 -2 +1 -3 +1 -1

Na Na+ + e- Mg Mg+2 + 2e- Rules for Naming Ions When metals lose electrons they become ions, but their name does not change. Na Na+ + e- electron sodium sodium Mg Mg+2 + 2e- 2 electrons magnesium magnesium

F + e- F- S + 2e- S-2 Rules for Naming Ions When nonmetals gain electrons they become ions, and their name does change. F + e- F- fluoride fluorine electron S + 2e- S-2 sulfur 2 electrons sulfide

chlor- + -ide = chloride Rules for Naming Ions 1. The names of metals do not change. 2. Changing the name of nonmetals: root of element name + -ide = name of ion Examples: The name of chlorine’s ion: chlor- + -ide = chloride The name of nitrogen’s ion: nitr- + -ide = nitride

Examples of naming ions: The name of calcium’s ion: calcium (The names of metals don’t change!) The name of oxygen’s ion: ox- + -ide = oxide The name of aluminum’s ion: aluminum (The names of metals don’t change!)

Write the name of each of the ions on your notes. sulfide lithium nitride bromide potassium chloride oxide hydrogen (+), hydride (-)

There are also ions that form after elements have shared electrons There are also ions that form after elements have shared electrons. These ions are known as polyatomic ions, and each polyatomic ion already has a name.

Write the name of each of the polyatomic ions on your notes using your reference sheet as a guide. sulfate carbonate permanganate sulfite hydroxide nitrate

Steps for Naming Ionic Compounds CaBr2 calcium bromide Step 1: Write the name of the metal ion. Step 2: Write the name of the nonmetal ion. Step 3: YOU ARE DONE! It is that easy.

Group Practice problems

1. NaF 2. MgO sodium fluoride magnesium oxide 3. SrCl2 4. Li2S strontium chloride lithium sulfide 5. CaO 6. KI calcium oxide potassium iodide

When polyatomic ions are used, simply use the name of the polyatomic ion in the compound. 1. NH4F 2. CaSO4 ammonium fluoride calcium sulfate 3. Mg(NO3)2 4. NaOH magnesium nitrate sodium hydroxide

Name the ionic compounds that are found on your notes. calcium chloride potassium sulfide potassium permanganate barium oxide ammonium chloride cesium chloride magnesium sulfate sodium bromide aluminum phosphide

Textbook practice problems: Pg. 187 – do every other letter Pg