The Periodic Table by Anayeli Gonzalez

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Across
  1. 3. Group 2, reactive but less than alkali metals
  2. 9. Elements in groups 3–12, often colorful
  3. 13. Properties repeat with atomic number
  4. 15. Weighted average of isotopes' masses
  5. 16. Pure substance made of one type of atom
  6. 17. Arrangement of electrons in orbitals
  7. 20. Rare earth elements below the main table
Down
  1. 1. Dull, brittle, poor conductors
  2. 2. Electrons in the outermost shell
  3. 4. Tendency to undergo chemical change
  4. 5. Group 17, very reactive nonmetals
  5. 6. Vertical column on the periodic table
  6. 7. Have properties of both metals and nonmetals
  7. 8. Smallest unit of matter
  8. 10. Number of protons in the nucleus
  9. 11. Same element, different number of neutrons
  10. 12. Shiny, malleable, good conductors
  11. 14. Group 1, very reactive with water
  12. 18. Group 18, inert and stable gases
  13. 19. Horizontal row on the periodic table