Related Clues:

• 'Charmed' particle
• Quarky item?
• Powerful particle
• Fermi's bit
• -- smasher (accelerator)
• Molecular component
• Power source
• Unstable particle
• Electrolysis particle
• 'Charge' missing from 18-, 20-, 55- and 61-Across, and 11- and 28-Down
• Smasher bit
• It's attractive and has a charge
• Lab particle
• Quark plus antiquark
• Teensy particle