It is a compound because it is made of oxygen, hydrogen and other elements.
Magnesium is a chemical element, not a compound.
Copper is a chemical element. It can be a compound but copper is usually known as a chemical element.
Air is a mixture of different gases, including nitrogen, oxygen, carbon dioxide, and others, rather than a compound or element. It is not a pure substance but a combination of gases that makes up Earth's atmosphere.
Pb is a compound.
Radium is a chemical element; a compound has a minimum of two chemical elements.
Sodium is a chemical element. Salt is a compound of sodium and chlorine.
Neon (Ne) is a chemical element, not a compound.
Helium (He) is a chemical element, not a compound; the chemical symbol is He.
Francium is not a compound, but a chemical element.
Americium is not a compound, it is a chemical element.
A metal is a chemical element not a compound.
Xenon is a chemical element.