Atoms and Elements

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Across
  1. 3. The second most abundant metal on Earth.
  2. 4. An element that makes up water.
  3. 5. An extremely ductile metal.
  4. 9. The lightest metallic element.
  5. 12. Has the highest melting point among metalloids.
  6. 13. A negatively charged ion.
  7. 18. A law of science about matter.
  8. 19. A positively or negatively charged element.
  9. 20. You can find this element in most fire suppression systems.
Down
  1. 1. One of the rarest gasses on Earth, and also Superman's home planet.
  2. 2. Found in toothpaste.
  3. 3. Non-charged subatomic particles.
  4. 6. This element sustains life in all forms on Earth.
  5. 7. Used to produce chipsets in computers.
  6. 8. A positively charged ion.
  7. 10. Negatively charged subatomic particles.
  8. 11. Positively charged subatomic particles.
  9. 14. Subatomic particles outside atoms.
  10. 15. This element is the third lightest halogen.
  11. 16. An element commonly found in batteries.
  12. 17. The second most common metal on Earth.
  13. 18. An element we breathe out in the form of a dioxide.