Naming Ionic Naming Ionic CompoundsCompounds

Ch. 9 Part IICh. 9 Part II

Naming Ionic Naming Ionic CCompoundsompounds

For ionic compounds where the metal always has the same oxidation number,

1) Name the metal.EX: BaBrEX: BaBr22

Barium

Naming Ionic Naming Ionic CCompoundsompounds

For ionic compounds where the metal always has the same oxidation number,

2) Write the name of the non-metal, and change the end to –ide. Barium brom ine ide

EX: BaBrEX: BaBr22

Naming Ionic Naming Ionic CCompoundsompounds

If there is a polyatomic anion, then you do not change the ending: EX: Ca(NOEX: Ca(NO33))22

Calcium nitrate

Name These:

Na2O

MgCl2Na2CO3

Naming Ionic Naming Ionic CCompoundsompounds3)3)If a positive ion (a metal) can If a positive ion (a metal) can

have more than one oxidation have more than one oxidation number, you have to number, you have to designate its charge in the designate its charge in the name!name!

We do this by putting the charge We do this by putting the charge as a roman numeral in as a roman numeral in parenthesis between the parenthesis between the positive positive and negative and negative ion.ion.

Naming Ionic Naming Ionic CCompoundsompoundsWhy do we need to do that?

Name: Fe2O3

FeO

These both exist in nature, so we have to show which one we mean.

Naming Ionic Naming Ionic CCompoundsompounds

Fe2O3Name it:

Iron OxIron (III) Oxygen

ide ( ) III

-2

If this is true, then what was iron to begin with?

+3Reverse criss cross to find the charge of

the iron:

Reverse criss cross to find the

charge of the iron:

Naming Ionic Naming Ionic CCompoundsompounds

Fe OName it:

Iron Ox Iron (II) Oxygen

ide ( ) II

-1

If this is not true, the numbers must have been reduced.

+2 -2

Naming Ionic Naming Ionic CCompoundsompoundsMetals that don’t need parentheses:Group I, II and IIIAZn, Cd (always +2) and Ag (always

+1)

Which means transition, inner transition and other metals do!

Naming Ionic Naming Ionic CCompoundsompoundsFinal flowchart of how to name:

Name the positive ion.

Does it need a roman numeral?

If so, reverse criss cross, if not, ignore.

Name the negative ion and:

If a nonmetal end in -ide; if not, end normally

Name these:

Na2S

CuCl2K2SO4

Pb(NO3)4