
Atom | Definition, Structure, History, Examples, Diagram, & Facts ...
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 …
Atom - Development, Theory, Structure | Britannica
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. …
Atomic physics | Structure, Particles & Energy | Britannica
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.
Chemical element - Atomic Structure, Periodic Table, Properties ...
Jan 9, 2026 · Atoms, then, would be the ultimate carriers of the properties associated with bulk matter. The atomic hypothesis is usually credited to the Greek philosopher Democritus, who considered all …
Chemical bonding | Definition, Types, & Examples | Britannica
Dec 9, 2025 · The type of bond that is most likely to occur between two atoms can be predicted on the basis of the location of the elements in the periodic table, and to some extent the properties of the …
atom - Students | Britannica Kids | Homework Help
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.
atom - Kids | Britannica Kids | Homework Help
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.
Atomism | Definition, Philosophy, History, & Facts | Britannica
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 …
Atom - Electrons, Nucleus, Bonds | Britannica
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 …
Mole | Definition, Number, & Facts | Britannica
Jan 1, 2026 · The number of atoms or other particles in a mole is the same for all substances. The mole is related to the mass of an element in the following way: one mole of carbon-12 atoms has …