Molecules & Bonding

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Across
  1. 6. Table entry?
  2. 8. NaCl, familiarly
  3. 11. Tiny negative particle
  4. 13. Two or more elements joined
  5. 14. Suffix with chlor-
  6. 15. Chemist’s counting unit
Down
  1. 1. Atom with extra neutrons
  2. 2. Atomic variant
  3. 3. Outer electron count
  4. 4. Group of atoms bonded together
  5. 5. Outer electron count
  6. 7. It has mass and occupies space
  7. 9. What holds atoms together
  8. 10. Building block of the periodic table
  9. 12. Particle with a charge