chemistry 2nd

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Across
  1. 4. Grey mass in the sky, made up of very small floating drops of water
  2. 5. It’s in the middle of the atom
  3. 6. Any of the four substances (earth, water, air, and fire)
  4. 7. Heavy and positively charged particle
  5. 8. Negative ion
  6. 9. Positive ion
Down
  1. 1. Not supporting or helping either side in a conflict
  2. 2. An arithmetical value like 4
  3. 3. Tiny and negatively charged particle
  4. 5. Heavy and neutral particle
  5. 8. A group of them bonded together is a molecule