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Science Says… …How Olympians Have Changed. http:// Learning goals:. By the end of class, I will be able to: Write the formula AND name the chemical formula for ionic compounds

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science says how olympians have changed
Science Says……How Olympians Have Changed
learning goals
Learning goals:
  • By the end of class, I will be able to:
    • Write the formula AND name the chemical formula for ionic compounds
    • Recognize multivalent elements on the periodic table
    • Write the formula AND name multivalent compounds


What do we know about ionic compounds???

  • Ionic compounds exist between a metal and non-mental
  • The overall charge of an ionic compound is 0.
  • To name ionic compound, write the metal first and the non-metal second, change the ending of the non-metal to “ide”
review naming writing uni valen t ionic compounds
Review Naming & Writing Univalent Ionic Compounds
  • MgS
  • NaCl
  • Al2O3
  • Calcium sulphide
  • Zinc phosphide
  • Calcium iodide
  • Potassium fluoride

Challenge #1 – Complete with a Partner

  • Are the following ionic compounds possible? Explain why or why not.
      • (a) Ca2P3
      • (b) LiI
      • (c) NaBr

Crisscross Rule for Writing Formulas

Step 1: Write the symbols of each element (remember to write the symbol for the metal first)

Step 2: Write the ion charge above each corresponding symbol. Remember that the ion charge is based on the number of electrons gained (negative) OR lost (positive) to become an ion.

Step 3: Crisscross the ion charges, erase the signs of each ion charge, and write them as subscripts


Examples of Writing Formulas

  • Write the correct formula for a compound of aluminum and sulphur
  • (a)



Al S

= Al2S3


Examples of Writing Formulas

  • Write the correct formula for a compound of barium and oxygen
  • (b)



Ba O

= Ba2O2

Note: If you need the same number of each ion, you can reduce the formula to one of each ion, as shown here.

= BaO


Challenge #2 – Complete with a Partner

  • What do you do if an ion has two or more possible charges?
      • Give examples to support your answer.
multivalent elements
Multivalent Elements
  • A metal that can form an ion in more than one way
    • Which elements in the periodic table have more than one ionic charge?
  • the name of an ion of a multivalent metal ALWAYS contains a Roman numeral that indicates the ion charge
    • ONLY multivalent metals have Roman numerals!!!

Eg: Copper 1+ is named copper (I)

Copper 2+ is named copper (II)

multivalent compounds
Multivalent Compounds
  • The roman numeral indicates the ionic charge of the multivalent metal

Eg: Copper (II) chloride 2+ 1- Copper (II) chlorine CuCl2

  • Name this multivalent compound:
    • MnO2
  • Write the formula for this multivalent compound
    • Copper (II) oxide
practice naming writing multivalent ionic compounds
Practice Naming & Writing Multivalent Ionic Compounds

Platinum(IV) oxide

Iron(III) sulfide

Copper(I) oxide

  • TiF4
  • Cr3P2


stump your partner
Stump your partner
  • On a sheet of paper, write down the chemical formula or name of 10 compounds
    • 5 should be ionic compounds
    • 5 should be multivalent ionic compounds
  • Switch papers with a partner and see if you can name or write the formula for their compounds!

Magnesium Oxide

  • Aluminum Oxide

Potassium Chloride

Sodium Bromide

  • Lithium Oxide
  • Nickel (II) Phosphide
  • Zinc Oxide
  • Mercury (I) Oxide

Cobalt (II) Oxide

Iridium Nitride

  •  Li2O
  •  CaBr2
  •  Ni3N2


  • SnBr4
  •  Al2S3
  •  Cd3N2
  •  Fe203
  • CuCl
  • AuF