Periodic table starter

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Across
  1. 3. A metal found in rechargeable batteries. (7)
  2. 4. The group of metals in the first column of the periodic table. (6)
  3. 6. A gas used in colorful advertising lights. (4)
  4. 11. The first and lightest element in the universe. (8)
  5. 13. A yellow element that smells like rotten eggs. (6)
  6. 15. The only non-metal in Group 13 of the periodic table. (5)
  7. 16. A vertical column in the periodic table. (5)
  8. 18. The negatively charged particle in an atom. (8)
  9. 19. The group of reactive non-metals in Group 17. (7)
Down
  1. 1. An element used in balloons to make them float. (6)
  2. 2. The element "potassium" is often associated with this fruit. (6)
  3. 5. The scientist who created the first periodic table. (9)
  4. 7. The gas most animals need to breathe. (6)
  5. 8. A horizontal row in the periodic table. (6)
  6. 9. A metal used to make steel and magnetic tools. (4)
  7. 10. A liquid metal used in old thermometers. (7)
  8. 12. This gas makes up most of the Earth's atmosphere. (8)
  9. 14. The element found in all living things. (6)
  10. 17. A noble gas used in light bulbs. (5)
  11. 20. A shiny, precious metal often used in jewelry. (4)