| Atom | |
|---|---|
| A semi-accurate depiction of the helium atom. The darkness of the electron cloud corresponds to the line-of-sight integral over the probability function of the 1s electron orbital. The magnified nucleus is schematic, showing protons in pink and neutrons in purple. In reality, the nucleus (and the wavefunction of each of the nucleons) is also spherically symmetric. (For more complex nuclei this is not the case.) | |
| Classification | |
| Smallest recognised division of a chemical element |
| Mass: | ≈ 1.66 × 10 to 4.52 × 10 kg |
| Electric charge: | zero |
| Diameter (approx.): | 100 pm to 400 pm |
In chemistry and physics, an atom (Greek άτομον meaning "indivisible") is the smallest possible particle of a chemical element that retains its chemical properties. The word atom originally meant the smallest possible indivisible particle, but after the term came to have a specific meaning in science, atoms were found to be divisible and composed of smaller subatomic particles.
More on [ Atom ]

Acorn Atom Projects - Includes details of a DRAM interface, routines for triangle filling, horizontal line drawing, and ROM reading, a memory map diagram, and a parts list.
Atom Review - The Acorn Atom Revisited - Detailed information about the Atom, along with photographs, diagrams, and manuals to download.
Meta Description: [ Atom Review restoring an old 8 bit 6502 computer ]
Colin's Un-official Acorn Atom Home Page - Specification, and hardware and software details.
Meta Description: [ Un-official ACORN ATOM Home Page ]
HCHOF: Acorn Atom - Overview, technical details, and a photograph.
Installing the ATOM Econet card - Describes how to install an Econet card in an Atom.
Old-Computers.com: Atom - Technical characteristics, a photograph, and a brief description.
The Entry into the Home Market - The Acorn Atom - An overview of the machine.
The Machine Room: Atom - Photographs, description, trivia, and detailed specification.
Meta Description: [ Established early 1995, this site hosts information on numerous interesting, old computers. There are pictures, descriptions, technical details, trivia, links and information for collectors. The site is dynamic and community-based, so it is constantly updated and improved. ]
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The PCB-Gallery - Photograph of the PCB, along with technical specification.
Yet Another Computer Museum - Acorn Atom - Photographs of the computer, packaging, circuit board, and accessories, along with a description, technical details, and summary of available hardware expansion options.
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