Physical Science Crossword

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Across
  1. 2. Horizontal rows of the periodic table.
  2. 3. Gases Group 18 elements, stable and unreactive.
  3. 4. The particle with a positive charge.
  4. 6. The particle with a negative charge.
  5. 9. The modern periodic table is arranged by increasing ______ number.
  6. 13. Energy needed to remove an electron.
  7. 14. Group 2 elements, reactive but less so than Group 1.
  8. 15. Elements found in the “stair-step” line, semiconductors.
  9. 17. Elements in Group 17, also called “salt formers.”
  10. 19. The central region of an atom.
  11. 20. Elements that are dull, brittle, and poor conductors of electricity.
  12. 21. Most abundant element in the universe.
Down
  1. 1. Number of protons in an atom.
  2. 2. Vertical columns of the periodic table.
  3. 3. Elements that can act like metals or nonmetals depending on conditions.
  4. 5. The particle with no charge found in the nucleus.
  5. 7. Elements in Group 1, highly reactive with water.
  6. 8. Trend: Atomic size ______ as you go down a group.
  7. 10. Scientist who first organized the table by atomic mass.
  8. 11. Smallest unit of matter.
  9. 12. Ability of an atom to attract electrons in a bond.
  10. 16. Shiny elements that are good conductors of heat and electricity.
  11. 18. Atomic number 79, symbol Au.
  12. 20. Scientist who arranged the periodic table by atomic number.