01Size2.00 nm
DNA
The instruction book that builds you — and most of every other living thing.
BiologyMicro-World
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Forschungszentrum Jülich (CC BY-SA 3.0)
Picture this
If an atom were a marble in your palm, a single strand of human hair beside it would stretch across an entire city.
An atom is almost entirely empty space — a dense nucleus surrounded by a cloud of electrons that doesn't really orbit so much as exist as a probability. The character of every material around you, from oxygen to gold, comes from how many protons sit in that nucleus and how the electron cloud is shaped.
Did you know?
Strip away an atom's empty space and pack the nuclei together — and the entire human race would fit inside a sugar cube. The rest of you is mostly nothing.
Last updated 2026-05-17
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Scale
The smallest piece of any chemical element.
Size
100 pm
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