PERIODIC TABLE

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Across
  1. 2. An atom that has become electrically charged.
  2. 5. The staircase that separates metals from nonmetals begins below this element.
  3. 6. Can be pounded into shapes.
  4. 9. Can be pulled into a wire.
  5. 11. Group 2 elements.
  6. 13. The number of protons in the nucleus of an atom.
  7. 15. A subatomic particle with a negative charge.
  8. 18. This group consists of very unreactive gases.
  9. 19. The number of groups in the periodic table.
  10. 21. An atom with the same number of protons and a different number of neutrons from other atoms of the same element.
  11. 24. An element that is dull and brittle.
  12. 25. The law that states that the properties of elements repeat as a function of their atomic numbers.
  13. 27. Most nonmetals are in this state at room temperature.
  14. 29. The central core of an atom.
Down
  1. 1. The first alkali metal.
  2. 3. A liquid nonmetal.
  3. 4. He created the first periodic table.
  4. 7. An element that is shiny and conductive.
  5. 8. A subatomic particle with no electrical charge.
  6. 10. Elements that have both metal and nonmetal characteristics.
  7. 12. The process in which two atomic nuclei combine.
  8. 14. The sum of protons and neutrons in the nucleus.
  9. 16. A subatomic particle with a positive charge.
  10. 17. Another name for a group.
  11. 20. Group 17 elements.
  12. 22. Horizontal rows in the periodic table.
  13. 23. A liquid metal.
  14. 26. Most metals are in this state.
  15. 28. The number of periods in the periodic table.