Ionic Compound Nomenclature

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Slide 1

Ionic Compound Formulas

Slide 2

Ions

Cation: A positive ion

Mg2+, NH4+

Anion: A negative ion

Cl-, SO42-

Slide 3

Predicting Ionic Charges

Group 1:

Lose 1 electron to form 1+ ions

H+

Li+

Na+

K+

Slide 4

Predicting Ionic Charges

Group 2:

Loses 2 electrons to form 2+ ions

Be2+

Mg2+

Ca2+

Sr2+

Ba2+

Slide 5

Predicting Ionic Charges

Group 13:

Loses 3

electrons to form

3+ ions

B3+

Al3+

Ga3+

Slide 6

Predicting Ionic Charges

Group 14:

Lose 4

electrons or gain

4 electrons?

Neither! Group 13 elements rarely form ions.

Slide 7

Predicting Ionic Charges

Group 15:

Gains 3

electrons to form

3- ions

N3-

P3-

As3-

Nitride

Phosphide

Arsenide

Slide 8

Predicting Ionic Charges

Group 16:

Gains 2

electrons to form

2- ions

O2-

S2-

Se2-

Oxide

Sulfide

Selenide

Slide 9

Predicting Ionic Charges

Group 17:

Gains 1

electron to form

1- ions

F1-

Cl1-

Br1-

Fluoride

Chloride

Bromide

I1-

Iodide

Slide 10

Predicting Ionic Charges

Group 18:

Stable Noble gases do not form ions!

Slide 11

Predicting Ionic Charges

Groups 3 - 12:

Many transition elements

have more than one possible oxidation state.

Iron(II) = Fe2+

Iron(III) = Fe3+

Slide 12

Predicting Ionic Charges

Groups 3 - 12:

Some transition elements

have only one possible oxidation state.

Zinc = Zn2+

Silver = Ag+

Slide 13

Writing Ionic Compound Formulas

Example: Barium nitrate

1. Write the formulas for the cation and anion, including CHARGES!

Ba2+

NO3-

2. Check to see if charges are balanced.