Subatomic particles (9)

I think it could be either:

neutrinos

electrons

'subatomic particles' is the definition.
(electron is a kind of subatomic particle)

This is the entire clue.

(Other definitions for electrons that I've seen before include "Elementary particles, negatively charged" , "Elementary particles with negative charge" , "Negatively-charged particles" , "transported by conductor" .)

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

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