Atomic structure

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Across
  1. 3. the type of bonding in a gold ring.
  2. 6. the type of bonding in table salt (sodium chloride).
  3. 8. a scientist who suggested that atoms have a positively charged nucleus.
  4. 11. these elements are often catalysts.
  5. 13. a type of bonding by sharing electrons.
  6. 14. the most reactive halogen.
  7. 15. found on the right hand side of the periodic table.
Down
  1. 1. the state of a substance at a temperature between its melting and boiling point.
  2. 2. turning a gas into a solid.
  3. 4. the least reactive alkali metal.
  4. 5. the nucleus of an atom contains these.
  5. 7. the number of electrons shared in an oxygen molecule.
  6. 9. electrons that are free to move through a metal are said to be?
  7. 10. an element with 36 protons in its atom.
  8. 12. this group of the periodic table produces ions with two positive charges.