the structural units that make up the elements are called
The basic building block of any substance is the atom. Every element and compound is made up of one or more atoms. In making up of the atom an atom is made up of only one nucleus but can have several shells. Within the nucleus protons and neutrons are present.Every element has a specific number of protons.toms are tiny units of matter. All matter are made up of matter that occupies space and is made up of atoms. Atoms are the smallest particle of an element that can join up in whole numbers to form molecules.