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The Clue

Subatomic particle with no electric charge (8 letter answer)

The Answer

NEUTRINO

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Notes

The answer NEUTRINO is so rare that it appears less than once every 2900 puzzles.

Related Clues

Elementary particle
It's free of charge
Particle name coined by Enrico Fermi

Definition

NEUTRINO as a noun:

1. an elementary particle with zero charge and zero mass