Multiple charges - formulas & some review

Put the steps in order to write a formula for multiple charges

• reduce if needed

• Criss Cross the charges to make the compound add up to zero

• write the cation

• determine the charge (Roman number ..the charge on the metal)

• Lead (II) Chloride

• Lead (IV) Chloride

• Chloride (II) Lead

• Iron (III) Sulfide

• Iron (IV) Sulfide

• Iron (II) Sulfide

Why do Alkaie metals and alkaline earth metals, and Al, Ag, Cd, Zn not need Roman numerals?

• They don't need them

• They are automatically I

• We already know them

A group of atoms (a molecule) that act like one ion

• tripolyatomic ions

• polyatomic items

• duoatomic ions

• +1
• -1
• -3
• -2

Ternary Formulas: Polyatomic ions act just like any otehr ion when bonding.

• True

• False

Which is the correct ternary formula for Sodium Sulfate?

• -2
• -1
• -3
• +1