IPC Notes IPC Notes

Ionic Compound Ionic Compound Names & FormulasNames & Formulas

Remember…Remember…

ionsions - atoms that have a - atoms that have a positive or negative chargepositive or negative charge

Oxidation numberOxidation number – the – the charge that an ion has from charge that an ion has from the gain or los of electronsthe gain or los of electrons

Remember…Remember…

Metals tend to form Metals tend to form ions by losing ions by losing electrons, giving them electrons, giving them an overall positive an overall positive charge. charge.

Remember…Remember…

Nonmetals tend to form Nonmetals tend to form ions by gaining ions by gaining electrons, giving them electrons, giving them an overall negative an overall negative charge. charge.

Ionic Ionic CompoCompouundsnds

An ionic compound is An ionic compound is made from a metal made from a metal (positive ion) and a (positive ion) and a nonmetal (negative nonmetal (negative ion).ion).

Ionic Ionic CompoCompouundsnds

Though made from positively Though made from positively and negatively charged ions, and negatively charged ions, an ionic compound is an ionic compound is electrically neutral.electrically neutral.

The total charge of all the ions The total charge of all the ions in a compound is ZERO!!!in a compound is ZERO!!!

Chemical Chemical FoForrmulasmulas

A chemical formula A chemical formula tells you the type and tells you the type and number of atoms in the number of atoms in the representative unit of a representative unit of a compound.compound.

Writing ChemicWriting Chemicaal l FormulasFormulas

11) Write the symbol for ) Write the symbol for the first element given the first element given with its oxidation with its oxidation number.number.

+2

Writing ChemicWriting Chemicaal l FormulasFormulas

22) Write the symbol for ) Write the symbol for the second element the second element given with its given with its oxidation number.oxidation number.

+2

Writing ChemicWriting Chemicaal l FormulasFormulas

3) Criss cross the numbers 3) Criss cross the numbers and write them as and write them as subscripts without the subscripts without the positive or negative signs.positive or negative signs.

ONLY THE NUMBERS ONLY THE NUMBERS CROSS…NOT THE + or -!CROSS…NOT THE + or -!

Writing ChemicWriting Chemicaal l FormulasFormulas

4) If there is a charge 4) If there is a charge of one, do not write it. of one, do not write it. The one is implied. The one is implied.

(just like in Algebra, (just like in Algebra, you don’t write 1x)you don’t write 1x)

Writing ChemicWriting Chemicaal l FormulasFormulas

5) If you have 5) If you have subscripts that are the subscripts that are the same number with same number with opposite signs (like +2 opposite signs (like +2 & -2) they cancel out.& -2) they cancel out.

ExamplesExamples

Barium & ChlorineBarium & Chlorine

ExamplesExamples

Aluminum & SulfurAluminum & Sulfur

ExamplesExamples

Calcium & OxygenCalcium & Oxygen

ExamplesExamples

Sodium & PhosphorusSodium & Phosphorus

ExamplesExamples

Magnesium & NitrogenMagnesium & Nitrogen

ExamplesExamples

Aluminum & FluorineAluminum & Fluorine

Naming Ionic Naming Ionic CCompoundsompounds

For naming an ionic For naming an ionic compound,compound,

1) Name the first element.1) Name the first element.2) Name the second element, 2) Name the second element,

but change the ending to but change the ending to – –ide.ide.

Naming Ionic Naming Ionic CCompoundsompounds

Example: NaExample: Na22OOSodium oxideSodium oxide

Example: MgClExample: MgCl22

Magnesium Magnesium chloridechlorideExample CaSExample CaS

Calcium sulfideCalcium sulfide

Name these:Name these:

Name these:Name these:

NaNa22S S

Name these:Name these:

NaNa22S S sodium sodium sulfidesulfide

Name these:Name these:

NaNa22S S sodium sodium sulfidesulfide

KCl KCl

Name these:Name these:

NaNa22S S sodium sodium sulfidesulfide

KCl KCl potassium potassium chloridechloride

Name these:Name these:

NaNa22S S sodium sodium sulfidesulfide

KCl KCl potassium potassium chloridechloride

LiLi22O O

Name these:Name these:

NaNa22S S sodium sulfidesodium sulfideKCl KCl potassium potassium chloridechloride

LiLi22O lithium oxideO lithium oxide

Name these:Name these:

NaNa22S S sodium sulfidesodium sulfideKCl KCl potassium potassium chloridechloride

LiLi22O lithium oxideO lithium oxide

AlClAlCl33

Name these:Name these:

NaNa22S S sodium sulfidesodium sulfideKCl KCl potassium chloridepotassium chloride

LiLi22O lithium oxideO lithium oxide

AlClAlCl33 aluminum chloridealuminum chloride