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Elementary particle (4)

Ross

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4

7 8

'elementary particle' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for atom that I've seen before include "Neutron and proton" , "An explosive particle as in bomb" , "Minute particle" , "Smallest particle in an element able to take part in a chemical reaction" , "Moat (anag.)" .)

I've seen this clue in The Guardian and the Sydney Morning Herald.
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