Related Clues:

• Label on the first of two file drawers, maybe
• Lepton's locale
• Physicist's subject
• Small matter?
• Smashable items
• Small bit
• It's always charged
• Bit of nuclear physics
• CGS unit
• Small bits of matter
• Supercollider projectile
• Minute quantities
• It carries a charge
• Work bit
• Sometimes it gets smashed