Ionic Formulas: Crossover Rule
Name Molecular Compounds: Traditional System
Name Ternary Ionics
Name Acids
Name Binary Ionics
100
Write the formula for sodium phosphate using the crossover rule.

Na3PO4

100

Name the following compound: N2O3

Dinitrogen trioxide

100

Name the following compound: BaCrO4

Barium Chromate 
100

Name the following acid: H2S

Hydrosulfuric acid

100

Name the following compound: FeBr3

Iron Bromide 

200

Write the formula for calcium chloride using the crossover rule.

CaCl2

200

Name the following compound: PCl5 

Phosphorus pentachloride 

200

Name the following compound: Mg3(PO4)2

Magnesium Phosphate

200

Name the following acid as a dry acid: HI

Hydrogen iodide 

200

Name the following compound: Ca3P2

Calcium Phosphide

300

Write the formula for aluminum sulfide using the crossover rule.

Al2S3

300

Name the following compound: As4S6

Tetraarsenic hexasulfide

300

Name the following compound: Al(NO2)3

Aluminum Nitrate 

300

Name the following acid: HClO2

Chlorous acid 

300

Name the following compound: Li3N

Lithium Nitride

400

Write the formula for barium carbonate using the crossover rule.

BaCO3

400

Name the following compound: C3P

Tricarbon monophosphide

400

Name the following compound: Sn2(SO4)4

Tin sulfate

400

Name the following acid as a dry acid: H2CrO4

Hydrogen chromate

400

Name the following compound: Al2Se3

Aluminum Selenide

500

Write the formula for ammonium oxide using the crossover rule.

(NH4)2O
500

Name the following compound: BO

Boron monoxide 

500

Name the following compound: (NH4)2C2O4

Ammonium Oxalate

500

Name the following acid: H2Cr2O7

Dichromic acid 

500

Name the following compound: Mg3N2

Magnesium Nitride 

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