Periodic Table

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Across
  1. 3. H2O
  2. 5. Ca
  3. 6. Gases Group 18 nonmetals
  4. 8. Na
  5. 9. Rows on the periodic table
  6. 10. NaCl
  7. 12. The smallest particle of an element that retains the element's properties
  8. 14. Number Number of protons and neutrons in the nucleus
  9. 16. Number The number of protons an atom has
  10. 17. Atoms of the same element that have different numbers of neutrons
  11. 19. Metal In the 2nd group on the periodic table
  12. 20. Particles in the nucleus that are electrically neutral
Down
  1. 1. Columns on the periodic table that share chemical properties
  2. 2. Cl
  3. 4. Particles with a negative charge
  4. 6. Positively charged center of an atom
  5. 7. Most are gases at room temperature
  6. 11. Metal The 1st group on the periodic table
  7. 13. The kind of electrons on the outer orbital
  8. 15. Particles in the nucleus with a charge of +1
  9. 18. Group 17