The Periodic Table

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Across
  1. 7. most abundant element in the universe
  2. 8. noble gases are the least _____________.
  3. 11. two or more neutral atoms held by covalent bond
  4. 13. ease and speed with which an element reacts to another
  5. 14. which table puts the elements in order
  6. 18. rows of the periodic table
  7. 19. predicted by an element's place on the periodic table
  8. 20. characteristics that determine how the element will react
Down
  1. 1. atoms of two or more elements bonded together
  2. 2. opposites do this
  3. 3. characteristics observed without changing identity of substance
  4. 4. columns of the periodic table
  5. 5. the outer shell of an atom
  6. 6. neutral part of an atom
  7. 9. chemical bond where atoms transfer electrons
  8. 10. chemical bond where atoms share electrons
  9. 12. negative part of an atom
  10. 15. atom that has a positive or negative charge
  11. 16. positive part of an atom
  12. 17. inventor of the periodic table