Lori McGee

Naming and writing formulas for binary ionic compounds

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Charges of major families

• Group 1, 2 and 13 have a + charge they are called cations

• Group 15, 16, and 17 have a - charge they are called anions

Poll

Which side of the periodic table are metals on?

• left

• right

• top

• bottom

Naming Ions

• Metal cation retain their elemental name (ex Ca⁺² is called calcium )

• null

• Nonmetal anions will end with -ide (ex N-3 is called nitride)

Multiple Choice

Oxygen is a nonmetal. What is the proper name for O^-2 ion?

• oxygen

• oxide

Multiple Choice

Aluminum is a metal. What is the Al ⁺³ ion called?

• Aluminum

• Aluminide

Writing the chemical name

• The cation (metal) name goes first

• The anion (nonmetal) name ending in -ide goes last

• 
  

  example NaCl

• Na is sodium Cl is chlorine

• name is sodium chloride

Multiple Choice

What is the proper name for the compound CaS

• calcium sulfur

• calcium sulfide

• calcide sulfur

• sulfide calcium

Multiple Choice

What is the proper name for a compound made from nitrogen and potassium metal?

• Potassium Nitride

• Potassium Nitrogen

• Nitrogen Potasside

• Nitride Potassium

Writing a chemical formula

• Write the symbol and charge of the metal

• write the symbol and charge of the nonmetal

• Criss cross to make subscripts.

• Reduce the numbers if possible (smallest ratio is always used)

• ex Na ⁺¹ S^-2

• Crisscross Na₂S₁

Be sure to reduce if possible

• only the ratio matters so we reduce when we can

• 4 and 2 can both be divided by 2 so reduce

• 
  

Multiple Choice

What is the formula for a compound made from Al⁺³ and O^-2

• AlO

• Al₃O₂

• Al₂O₃

• O₃Al₂

Multiple Choice

What is the formula for sodium fluoride

• NaF

• Na₂F

• Na₂F₃

• NF

Multiple Choice

Should be reduce the formula Cu₂O₂?

• yes

• no

Multiple Select

When working with ionic compounds which type of ion is written first?

• nonmetal

• metal

• it doesn't matter

Multiple Choice

In ionic formulas it is mandatory to reduce the subscripts.

• true

• false