Related Clues:

• Itsy-bitsy bit
• Bond participant
• Small wonder?
• It may include a minus sign
• Electron loser or gainer
• 1950s filmstrip, "Our Friend, the ___"
• Cloud chamber bit
• Lithium-__ battery
• Particle in a cathode ray tube
• Fermi's tidbit
• It's tiny and attractive
• It has a plus or minus, in chemistry class
• Accelerator particle
• Accord trailer?
• Fermi's particle