Related Clues:

• Particles in particle accelerators
• Smithereens
• Ca++ and Cl-
• Bohr's study
• Bonding candidates
• Cyclotron bits
• Itsy-bitsy bits
• What's the matter?
• They undergo bonding
• Source of mesons
• Small matter?
• Smashable items
• Small bits of matter
• Minute quantities
• They carry a charge