Molecules is a leading international, peer-reviewed, open access journal of chemistry published semimonthly online by MDPI.

The modern concept of molecules can be traced back towards pre-scientific and Greek philosophers such as Leucippus and Democritus who argued that all the universe is composed of atoms and voids.

Jan 5, 2026 · Molecule, a group of two or more atoms that form the smallest identifiable unit into which a pure substance can be divided and still retain the composition and chemical properties of …

Sep 12, 2020 · Get the definition of a molecule. See examples of molecules and learn the different between a molecule and a compound.

Feb 2, 2023 · All objects that we see around us are made of molecules. From living objects such as a plant or an animal, including humans, inanimate objects like a chair, table, wall, door, windows, …

Sep 3, 2024 · Here's an explanation of what a molecule is (and is not) with examples of common molecules. A molecule is two or more atoms that form chemical bonds with each other, …

Nov 28, 2025 · Molecules are formed during a chemical reaction when bonds are broken and reformed between atoms. This is in contrast to when a covalent compound undergoes a physical …

Jul 5, 2024 · Molecules are composed of two or more atoms that are chemically bonded together. These atoms can be of the same element, forming a molecule of an element (e.g., O2, N2), or of …

Jul 20, 2025 · Molecules are formed when two or more atoms are joined together by chemical bonds. For instance, a single oxygen atom (O) can exist, but it often bonds with another oxygen …

These multi-atom combinations are called molecules. A molecule is the smallest part of a substance that has the physical and chemical properties of that substance. In some respects, a molecule is …