Some would be: Carbon (C), Oxygen (O), Nitrogen (N), Chlorine (Cl), Neon (Ne),
etc., etc.
A metal is a chemical element not a compound.
Copper metal is a chemical element.
Calcium chloride is a compound, not a chemical element.
Magnesium is a chemical element, a solid metal not a reaction.
Copper metal is an element and thus a pure substance.
Each metal has a specific chemical symbol.
A metal is a chemical element not a compound.
A metal is a chemical element, with no other elements.
A metal is a chemical element, any other mineral.
Copper metal is a chemical element.
Zirconium is a natural chemical element, metal, solid.
Ag is the element Silver (a metal)
Technetium is an artificial chemical element, a solid metal.
Aluminium is an element, a metal.
Calcium chloride is a compound, not a chemical element.
There is nothing "in" the metal beryllium. It is a chemical element.
Promethium is a chemical element, a metal.