You think probable to allotropes.
Element
A pure substance is a single element or compound, while a mixture is more than one atom or molecule. If there are multiple atoms, it would be a mixture.
Is every substance on earth made of one are more atoms
A substance made of one or more atoms is a chemical element or compound. Chemical elements are made up of only one type of atom, while compounds are composed of two or more different types of atoms bonded together.
A single compound is a substance made up of two or more elements that are chemically bonded together in a fixed ratio. For example, water (H2O) is a single compound made of hydrogen and oxygen atoms bonded together.
A chemical compound is the most general name for any single type of matter made from a specific arrangement of atoms. It consists of two or more different elements bound together in a fixed ratio by chemical bonds.
It would be an atom or a molecule (made up of more than one atoms)
The smallest particle of a substance that retains all the properties of the substance and is composed of one or more atoms is called a molecule. Each molecule is made up of one or more atoms chemically bonded together.
compound
If matter is made up of two or more elements and has the same ratio of atoms no matter the amount of the substance, it is a compound. A compound is a substance composed of two or more elements chemically bonded together in a fixed ratio.
Elements
compound