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Atom
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: [[Atom]]s consist of a small, central [[Atomic Nucleus|nucleus]] containing [[proton]]s and [[neutron]]s surrounded by [[electron]]s [[Electron Orbital|orbiting]] the [[Atomic Nucleus|nucleus]].
: The [[electron]]s [[orbit]] the [[Atomic Nucleus|nucleus]] in so called '[[Electron Orbital|electron shells]]'.
: [[Atom]]s range in size from a [[diameter]] of around 1x10<sup>-10</sup>m (0.1 [[nanometre]]s) to 5x10<sup>-10</sup>m (0.5 [[nanometre]]s), while the [[Atomic Nucleus|nucleus]] has a [[diameter]] of around 1.75x10<sup>-15</sup>m (1.75 [[femtometre]]s) to 15x10<sup>-15</sup>m (15 [[femotmetrefemtometre]]s). This means the '''nucleus''' is 100,000 times smaller than the [[atom]].
: Since [[molecule]]s are made of multiple [[atom]]s they can range from 0.2 [[nanometre]]s to several [[millimetre]]s long for long [[polymer]] chains.
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