The word PROTON has appeared in at least 33 clues on different crosswords.
|A hydrogen atom has one|
|An object of Bohr's research|
|Hydrogen has one|
|Hydrogen has only one of these in its nucleus|
|It's composed of three quarks|
|Nucleus of an atom.|
|One of helium's two|
|Part of a nucleus|
|Part of an atom.|
|Particle composed of three quarks|
|Positively-charged atomic particle|
|"p+, in physics"|
|Stable particle with a positive charge|
|It's always positive|
|A little matter that's positively elementary|
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