Periodic Table Crossword

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Across
  1. 2. Group 18 is known as the… noble
  2. 4. Positively charged particles found in the nucleus of an atom.
  3. 6. The number of periods in the periodic table is
  4. 8. Group 1 is known as the… metals
  5. 10. Elements in the same period have the same number of… electrons
  6. 11. The element with the symbol Cl is
  7. 12. The element in period 2 and group 16 is
  8. 14. The horizontal rows on the periodic table are called
  9. 15. A very light gas used in balloons.
  10. 16. The noble gas element in period 2 is
Down
  1. 1. The electrons in the outermost shell are called… electrons
  2. 3. Elements that conduct electricity well are called
  3. 5. The scientist who compiled the first periodic table was
  4. 7. The elements in group 17 are called
  5. 9. The number indicating the number of protons in an atom is called the ______ number.
  6. 10. The element with the symbol Na is
  7. 11. Elements needed by plants for photosynthesis from the air.
  8. 13. The vertical columns on the periodic table are called