What is composed of more than one atom?
Oxygen is an element. This means that it is composed of only one kind of atom, and it takes two atoms of oxygen to make one molecule of oxygen. A compound is composed of more than one kind of element. A simple example is carbon dioxide which is composed of one atom of carbon and two atoms of oxygen. A mixture is composed of more than one kind of compound.
Compounds can actually be molecules. A molecule is simply the smallest amount of something. A compound is a molecule composed of more than one type of atom. For instance, carbon dioxide has a chemical formula of CO2. Therefore there is one atom of Carbon, and two of Oxygen. Together, they form a single molecule of carbon dioxide. On the other hand, the element oxygen is composed of two oxygen atoms, which make up one molecule…
Compounds and molecules are composed of several atoms - by definition. You can have substance that is made of one single element. For instance, many metals exist as pure substances that are not compounds. However, the word compound itself implied that it is composed of more than one thing, not just a single type of atom.
The lightest nuclei is composed of one proton whose mass is around 1836 times the one electron mass. Any atom is composed of a nucleus (composed of protons and neutrons and the neutron is heavier than the proton) and surrounded by a number of electrons that are equal to the number of protons). So,alwaysthe nucleus is heavier than the mass of the surroundingelectrons.