Elements refer to more than a hundred basic metal and non-metallic substances in nature, which are composed of one atom. Each nucleus in its atom has the same number of protons, which cannot be decomposed by ordinary chemical methods, and can constitute everything Atoms are basic particles that are inseparable in chemical reactions. Atoms are indivisible in chemical reactions, but are divided into physical states. They are composed of atomic nuclei and electrons moving around them. Molecule is composed of atoms and is a kind of material The name of the elementary particle is a particle that exists alone and keeps chemical properties to a minimum. Based on the above definition, the following options are correct:. ['Atoms are the smallest particles that make up matter.', 'Air is made up of various tiny atoms.', 'Atoms with different numbers of protons are not the same type of element.', 'Carbon monoxide molecule (C. O) consists of one element of oxygen and one element of carbon.']