Jan 9, 2026 · Chemical elements are made up of only one type of atom—gold contains only gold atoms, and neon contains only neon atoms--and they are ranked in order of their atomic number (the total …

Jan 9, 2026 · Atom - Electrons, Nucleus, Bonds: Once the way atoms are put together is understood, the question of how they interact with each other can be addressed—in particular, how they form …

Jan 9, 2026 · Democritus believed that atoms were uniform, solid, hard, incompressible, and indestructible and that they moved in infinite numbers through empty space until stopped. …

It attempts to describe and account for the properties of molecules and atoms and their constituents— electrons, protons, neutrons, and other more esoteric particles such as quarks and gluons.

The tiny particles called atoms are the basic building blocks of all matter. Atoms can be combined with other atoms to form molecules, but they cannot be divided into smaller parts by ordinary means.

Atoms are made up of three basic types of particle: protons, neutrons, and electrons. These particles (as well as other particles smaller than atoms) are known as subatomic particles.

Dec 23, 2025 · Atomism is usually associated with a “ realistic ” and mechanistic view of the world. It is realistic in that atoms are not considered as subjective constructs of the mind employed for the sake …

Jan 9, 2026 · In Heisenberg’s method, properties of atoms are described by arrays of numbers called matrices, which are combined with special rules of multiplication. Today physicists use both wave …

Dec 9, 2025 · Even the simplest molecules consist of two nuclei and several electrons, and interesting molecules may contain a thousand atoms and tens of thousands of electrons.

Learn about the discovery of atoms and the instruments scientists use to see these small particles.