Nomenclature

Covalent

100

CO

Carbon monoxide

200

NO₂

Nitrogen dioxide

300

SeO

Selenium monoxide

400

SF₆

Sulfur hexaflouride

500

O₂F₂

Dioxygen diflouride

Ionic

100

CaS

Calcium Sulfide

200

NaOH

Sodium Hydroxide

300

Ca(CO₃)

Calcium Carbonate

400

FeBr₂

Iron (II) Bromide

500

Al(CN)₃

Aluminum Cyanide

Mixed

100

Li₂O

Lithium Oxide

200

SO₃

Sulfur trioxide

300

K₂SO₄

Potassium Sulfate

400

BrF₅

Bromine pentaflouride

500

Cu₂S

Copper (I) Sulfide

Ionic or Covalent

100

Mg(CO₃)

Magnesium Carbonate is ionic !

Mg is a metal and CO₃ is a polyatomic anion (aka. non-metal)

200

H₂O

Dihydrogen monoxide (or water) is a covalent compound!

Both are non-metals.

300

BeCl₂

Beryllium Chloride is an ionic compound!

Be is a metal and Cl is a non-metal.

400

PCl₅

Phosphorus pentachloride is a covalent compound.

Both are non-metals.

500

Ba(OH)₂

Barium Hydroxide is an ionic compound.

Ba is a metal and OH is a polyatomic anion. Also, both O and H are non-metals. 

Acids

100

HCl

Hydrochloric Acid

200

HNO₃

Nitric Acid

300

Hydrobromic Acid

HBr

400

HBrO₃

Bromic Acid

500

H₃P

Hydrophosphoric Acid