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Types of Compounds

Hydrogen + Nonmetal > Covalent Compound (Usually)
Hydrogen + Nonmetal > Covalent Compound (Usually)

Ionic bonding occurs between a metal and a nonmetal. Covalent bonding, on the other hand, occurs between two nonmetals. The properties of these two types of compounds are different. Ionic compounds are usually solids at room temperature, while covalently bonded compounds can be solids, liquids, or gases.

source: dummies.com
Metal + Nonmetal > Ionic Compound (Usually)
Metal + Nonmetal > Ionic Compound (Usually)

A molecular compound is made up of two non-metals. But, where do the metalloids (aka semi-metals) fall? Looking online, I read that some metalloid + non-metal compounds can create either compound.

Metal + Polyatomic ion > Ionic Compound (Usually)
Metal + Polyatomic ion > Ionic Compound (Usually)

However, the atoms in polyatomic ions are held together by covalent bonds. Compounds containing polyatomic ions are ionic compounds. The basic rule of thumb is ionic compounds take place between a positive ionic metal and a negative ionic non-metal.

source: socratic.org
Nonmetal + Nonmetal > Covalent Compound (Usually)
Nonmetal + Nonmetal > Covalent Compound (Usually)

Ionic compounds are (usually) formed when a metal reacts with a nonmetal (or a polyatomic ion). Covalent compounds are formed when two nonmetals react with each other. Since hydrogen is a nonmetal, binary compounds containing hydrogen are also usually covalent compounds.

source: angelo.edu

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