Here's why:

* Nonmetals tend to share electrons to form covalent bonds. This sharing creates the molecules that define molecular compounds.

* Metals typically lose electrons to form ionic bonds, creating ionic compounds.

Examples of elements that form molecular compounds:

* Hydrogen (H)

* Oxygen (O)

* Carbon (C)

* Nitrogen (N)

* Fluorine (F)

* Chlorine (Cl)

* Bromine (Br)

* Iodine (I)

* Sulfur (S)

* Phosphorus (P)

Examples of molecular compounds:

* Water (H₂O)

* Carbon dioxide (CO₂)

* Methane (CH₄)

* Ammonia (NH₃)

* Glucose (C₆H₁₂O₆)

Let me know if you have any other questions!