Multiple Oxidation Elements that form more than one

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Multiple Oxidation Elements that form more than one ion.

Multiple Oxidation Elements that form more than one ion.

• I CAN write formulas for and name compounds containing Multiple Oxidation elements.

• I CAN write formulas for and name compounds containing Multiple Oxidation elements.

What is a Multi. Ox element? • Certain elements, particularly from the TRANSITION ELEMENTS

What is a Multi. Ox element? • Certain elements, particularly from the TRANSITION ELEMENTS and a few HEAVIER AMN ELEMENTS tend to lose both VALENCE electrons as well as one or more from the NEXT ENERGY LEVEL below valence. • These are known as MULTIPLE OXIDATION STATE ELEMENTS or MULTIOX for short. • Since these come from the METALS of the periodic table, they are always CATIONS (+).

• There are quite a few elements that exhibit multiple oxidation. REFER TO

• There are quite a few elements that exhibit multiple oxidation. REFER TO THE HANDOUT PROVIDED.

Compounds with Multi. Ox Elements • Its easy to recognize a Multi. Ox element

Compounds with Multi. Ox Elements • Its easy to recognize a Multi. Ox element in the NAME OF A COMPOUND. – Following the name of the POSITIVE ELEMENT there will be a PARENTHESIS WITH A ROMAN NUMERAL. – The ROMAN NUMERAL indicates the POSITIVE CHARGE of the element IN FRONT OF IT. • EXAMPLE Iron (III) Sulfide The roman numeral indicates the IRON has a +3 charge in this compound. – This makes it easy to determine the formula for a compound containing a Multi. Ox element.

Practice Problems • Write the formula for these compounds: +3 +2 • Copper (II)

Practice Problems • Write the formula for these compounds: +3 +2 • Copper (II) Phosphide Iron (III) Oxide • 3 (+2) + 2 (-3) = 0 • Cu P • Cu 3 P 2 2 (+3) + 3 (-2) = 0 Fe O Fe 2 O 3

Naming Compounds with Multi. Ox elements from their formulas. • Naming a compound with

Naming Compounds with Multi. Ox elements from their formulas. • Naming a compound with a Multi. Ox element from its FORMULA requires a bit of working backwards. • 1. Look at the formula and refer to your Multi. Ox list if needed to see if there is a Multi. Ox element in the compound. • 2. Work BACKWARDS to determine the name of the compound.

Practice Problems • What is the name of the compound Pb. Cl 4 ?

Practice Problems • What is the name of the compound Pb. Cl 4 ? • 1. Check for a Multi. Ox element: LEAD • 2. Break the formula apart: • ( ? ) + 4 ( -1) = 0 • Pb Cl • 3. Use the NEGATIVE ION to determine the charge of the Multi. Ox ion: • +4 -4 • ( ? ) + 4 ( -1) = 0 • Pb Cl

• • • +4 -4 ( +4 ) + 4 ( -1) =

• • • +4 -4 ( +4 ) + 4 ( -1) = 0 Pb Cl Therefore this is LEAD (IV) so the name of the compound is: Lead (IV) Chloride

Another Practice Problem • What would the name of Sn. I 4 be? •

Another Practice Problem • What would the name of Sn. I 4 be? • +4 -4 • ( ? ) + 4 (-1) = 0 • Sn I • Therefore this is Tin (IV) so the compound would be: • Tin (IV) Iodide