chemistry

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