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 that …

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, …

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 change, in …

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 …

There are many substances that exist as two or more atoms connected together so strongly that they behave as a single particle. These multi-atom combinations are called molecules. Molecules are the …

‪Molecule Shapes‬ A X X ‪Model‬ O H H ‪Real Molecules‬ ‪Running with low graphics quality‬ ‪WebGL is not enabled or not available. Click to learn more.‬

As much as a car is a single unit made up of many parts, a molecule is a unit made up of atoms bonded around each other in certain fixed geometries. Shapes influence the physical and chemical …