Elements

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Across
  1. 5. they share.
  2. 9. The 18 vertical (up/down) columns of elements in the periodic table.
  3. 10. The building blocks of matter.
  4. 11. A negatively charged particle.
  5. 12. The 7 horizontal (across) rows of elements in the periodic table.
Down
  1. 1. The combined number of protons and neutrons found in the
  2. 2. A neutrally charged particle.
  3. 3. The smallest form of matter
  4. 4. A positively charged particle.
  5. 6. The number of protons found in an atom's nucleus.
  6. 7. A tool used by chemists to help arrange the elements based on certain
  7. 8. The positively charged center of an atom that contains protons and neutrons.