Periodic Table

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Across
  1. 2. Atoms tend to gain, lose, or share electrons to obtain 8 valence electrons.
  2. 3. Energy required to remove an electron.
  3. 4. Size of an atom.
  4. 6. Developed the first widely accepted periodic table.
  5. 8. Predictable pattern in element properties across periods and groups.
  6. 11. Group 17 elements (highly reactive nonmetals).
  7. 16. When elements are arranged by atomic number, their properties repeat in a predictable pattern.
  8. 17. Tendency of a substance to undergo chemical change.
  9. 19. Organized chart of all known elements.
  10. 20. Lanthanides and actinides.
  11. 23. One or two-letter abbreviation for an element.
  12. 28. Group 18 elements (least reactive).
  13. 29. Group 2 elements.
  14. 30. Poor conductor; often brittle when solid.
  15. 31. Horizontal row on the periodic table.
Down
  1. 1. Using periodic table trends to predict properties of elements.
  2. 5. Elements in Groups 1, 2, and 13–18.
  3. 7. Representation of valence electrons around an element symbol.
  4. 9. Elements in Groups 3–12.
  5. 10. Element with properties of both metals and nonmetals.
  6. 12. Charged atom or group of atoms.
  7. 13. First row below the periodic table.
  8. 14. Electrons in the outermost energy level.
  9. 15. Vertical column on the periodic table.
  10. 18. Second row below the periodic table.
  11. 21. Negatively charged ion.
  12. 22. Organized elements by atomic number.
  13. 24. Ability of an atom to attract electrons in a bond.
  14. 25. Group 1 elements (very reactive).
  15. 26. Good conductor; shiny, malleable, and ductile.
  16. 27. Positively charged ion.