Covalent
Ionic
Polyatomic
Charges
Formulas
100

ON3

Oxygen Trinitride

100

K2O

Potassium Dioxide

100

Cyanide

CN-

100

Copper (III)

Cu+3

100

Magnesium Carbonate

MgCO3

200

Dicarbon trisulfide

C2S3

200

Al2S3

*is there a Roman Numeral?*

Aluminum Sulfide

200

PO4-3

phosphate

200

Cu2S

*BONUS: name the entire compound, but has to have the correct charge to get the points (100)

Copper (I) Sulfide

200

Sulfur Dioxide

SO2

300

P2I3

Diphosphorous Triiodide 

300

Aluminum Trisulfide

AlS3

300

Nitrite

NO2-

300

Our Roman numerals tell us what?

What elements require a Roman Numeral?

The charge

Transition Metals

300

Sodium Sulfate

Na2SO4

400

HCl

Hydrochloric Acid or hydrogen chloride 

400

Copper (II) Oxide

CuO2

Oxygen has a +2 charge making Copper have a +2 Charge

400

What is the condensed form for acetate?

C2H3O2

400

PbBr2

Lead has what roman numeral AKA charge?

+2

400

Calcium Phosphite

*Don't worry about the subscripts. Just write the general formula*

Ca(PO3)

500

Trisulfur Hexafluoride

S3F6

500

Chromium (III) Bromide

*What does the Roman Numeral tell us?*

CrBr3

Chromium has a +3 charge based off the Roman Numeral meaning Bromine has to have a 3 subscript

500

OH-

Hydroxide

500

Overall, we want our compounds to have a charge to equal what? 

Zero

500

Mercury (I) Cyanide 

*Don't worry about the subscripts. Just write the general formula*

Hg(CN)