Where did Subatomic Particles With The Same Mass As Electrons appear in the Game?

It appeared on Fantasy World Group 875 Puzzle 2

Subatomic Particles With The Same Mass As Electrons

CodyCross Subatomic Particles With The Same Mass As Electrons Solution

This question is part of CodyCross Fantasy World > Group 875 > Puzzle 2.
Answers of Subatomic Particles With The Same Mass As Electrons might change from time to time on each game update.

Subatomic Particles With The Same Mass As Electrons

Positrons

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