Case's crossword puzzle

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Across
  1. 2. a vertical row of the periodic table
  2. 7. a element with 1 proton
  3. 9. a element in bananas
  4. 10. a neutral charge
  5. 15. an element that is good for your bones
  6. 16. has four protons
  7. 17. basic building block of matter.
  8. 19. describes how likely an element is to form bonds with other elements
  9. 20. an atom that has gained or lost one or more electron
Down
  1. 1. a shiny metal that is very expensive, has 79 protons
  2. 3. a positive charge
  3. 4. a chemical element that generally lacks a predominance of metallic properties
  4. 5. has three protons
  5. 6. a staircase of elements that separate metal and nonmetal
  6. 8. a negative charge
  7. 11. a substance whose atoms all have the same number of protons
  8. 12. An element that has 22 protons
  9. 13. a element that makes balloons float
  10. 14. a horizontal row of the periodic table
  11. 18. elements on the periodic table that are malleable