chemistry crossword

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Across
  1. 3. created by equal but opposite charges that are separated by a short distance (6)
  2. 6. 14 elements with atomic numbers from 58 to 71 (5)
  3. 7. electronegativity that has a difference of 1.8-3.3 is what kind of bond (6)
  4. 9. bonding in molecules or ions that cannot be correctly represented by a single lewis structure (6)
  5. 13. polyatomic ions that contain oxygen (7)
  6. 15. indicates main energy level occupied by the electron (4)
  7. 16. alkali metals and alkaline earth metals are in what block? (5)
  8. 17. numerical prefix that indicates 5 atoms (7)
Down
  1. 1. 14 elements with atomic numbers from 90 to 103 (5)
  2. 2. an atom or group of bonded atoms that has a positive or negative charge (5)
  3. 4. shows the whole number ratio of elements in a compound (7)
  4. 5. the percentage by mass of each compound is known as what? (7)
  5. 8. compounds composed of 2 elements (7)
  6. 10. substance that can be hammered or beaten into thin sheets (6)
  7. 11. charged group of covalently bonded atoms (6)
  8. 12. according to the _______ principle an electrons occupies the lowest energy orbital that can receive it (4)
  9. 14. Russian chemist to create the periodic table (5)