Ionic Compounds Review Section 3.2

Ion Charges Top right corner of the element square on the periodic table. Oxygen has a 2- in the corner so it’s ion charge is 2-

Naming Ionic Compounds Two Rules: Chemical name of the metal (positive ion) goes first, followed by the non-metal (negative ion). The name of the non-metal (negative ion) changes its ending to ide.

Some elements have more than one ion charge, such as copper (Cu), lead (Pb), and iron (Fe). To show which ion is being used a Roman numeral is added. Ex: iron (II) = Fe2+ copper (I) = Cu+ *Reminder: Roman numerals: I=1, II=2, III=3, IV=4, V=5, VI=6, VII=7

Steps to writing ionic formulas

Step 1 Write each ion with its charge *Remember: Certain columns on the periodic table are always the same, and some have more than one choice.

Step 2 Figure out how many of each you need to make the charges balance. The best way is to do a switch-er-oo between the number of atoms and the opposite ion’s charge. Ca2+ and Br – 1 Ca and 2 Br Ca2+, Br – ,Br –

Step 3 Write the formula using subscripts to show how many of each atom you need AND the state Ca2+ and Br – 1 Ca and 2 Br Ca2+, Br – ,Br – CaBr2 (s) * Ionic compounds are always solid (s)

Ionic Compound Naming Race… With the person beside you, work together to solve ten problems. Once you think you have all 10 correct, bring them to Mrs. Tom Huete to check over. If there is another group with her, make a line up. The first group to complete all 10 correctly wins. Once Mrs. Tom Huete gives the go ahead, begin round two. GOOD LUCK, HAVE FUN!!