chemistry

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Across
  1. 2. a positively charged element
  2. 3. A gas lighter than air that is used to fill up party balloons
  3. 5. An Israeli Noble Prize woman
  4. 7. type of bond where elements share electrons
  5. 8. The positive particle in the nucleus of an atom
  6. 11. The compound that H2O stands for
  7. 13. precious metal
  8. 14. a particle that consists of more than one atom
Down
  1. 1. The arrangement of all the elements in the universe
  2. 4. The formula of table salt
  3. 6. consists of 80% of the air we breath
  4. 7. The metal the Statue of liberty is made of
  5. 9. a group of elements that have a full energy level
  6. 10. carbon in a beautiful form
  7. 12. a negative particle in the atom