The Periodic Table Puzzle

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Across
  1. 3. Group 1 highly reactive metals that react vigorously with water.
  2. 4. British physicist who arranged the periodic table by atomic number.
  3. 6. Horizontal rows on the periodic table.
  4. 7. Energy levels or orbits where electrons are found.
  5. 9. The B-group elements located in the center of the periodic table from Groups 3 to 12,
  6. 13. An atom or molecule with an overall electrical charge.
  7. 15. Positively charged subatomic particles found in the atomic nucleus.
  8. 17. Group 2 metals.
  9. 20. Negatively charged particles orbiting the nucleus in energy levels.
  10. 21. The atomic number of aluminum
  11. 24. The dense central core of an atom containing protons and neutrons.
  12. 25. Elements with properties half between metals and nonmetals.
  13. 26. Neutral subatomic particles located in the atomic nucleus.
  14. 28. Electrons located in the outermost energy level of an atom.
  15. 29. The total number of groups in the modern periodic table
  16. 30. A positively charged ion formed by losing electrons.
Down
  1. 1. Russian chemist who created the first widely recognized periodic table by atomic mass.
  2. 2. Group 17 reactive nonmetals such as fluorine and chlorine.
  3. 5. The distribution of electrons among the various energy levels.
  4. 8. The nonmetallic element with an atomic number of 6.
  5. 10. A negatively charged ion formed by gaining electrons.
  6. 11. The electrical state of an atom when the number of protons equals electrons.
  7. 12. Elements on the left and center of the table that are malleable and good conductors.
  8. 14. Group 18 unreactive, chemically stable gases.
  9. 16. The total number of periods in the modern periodic table.
  10. 18. Vertical columns on the periodic table
  11. 19. A lightweight, silvery-white metal with atomic number 13.
  12. 22. The Group 18 noble gas with an atomic number of 2 that has a stable duet of electrons
  13. 23. Elements on the right side of the periodic table that are poor conductors.
  14. 27. The tendency of a substance to undergo a chemical change or reaction.