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...oms can remain bound to each other by [[chemical]] bonds based on the same force, forming a [[molecule]]. An atom containing an equal number of protons and ...s://en.wikipedia.org/wiki/Scanning_tunneling_microscope scanning tunneling microscope]. Over 99.94% of an atom's mass is [[concentrated]] in the [[nucleus]], wit

...species, i.e., short-lived assemblies ([[resonance]]s) of electrons and [[atomic nucleus|nuclei]], such as [[radical (chemistry)|radicals]], molecular [[ion ...dual atoms may be traced in some circumstances by use of an [[atomic force microscope]]. Some of the largest molecules are [[supermolecule]]s.