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

Mar 13, 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 that …

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.

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

Mar 25, 2026 · 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 change, in …

Learn about how different elements combine to form compounds with entirely new properties and how these compounds can exist as molecules or crystals.

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 different …

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, …

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 atom to …

This page explores molecules as combinations of two or more atoms with unique properties, distinguishing them from individual elements. It detailed compounds, their constant composition, and …