An atom of plutonium contain protons, neutrons and electrons - not other elements.
Basically, all (or most) of the elements found in the periodic table, up to plutonium.
Carbon and hydrogen are the two main elements that make up crude oil.
Calcium (Ca) and Oxygen (O) are the two elements that make up calcium oxide.
Iron is, itself, and element. It is not a compound of two elements.
There are many reactive elements. They show up more on the upper left of the Periodic Table. Some of these are plutonium, uranium, Mercury and lead.
There are two elements that make up the compound NaBr, or sodium bromide. These two elements are sodium and bromine.
PotassiumFluorine
Hydrogen and fluorine are the two elements that make up hydrogen fluoride (HF).
The two elements that make up most of the oceans are hydrogen and oxygen, forming water molecules.
two or more different elements
Power and legitimacy
Iron and oxygen