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Across
  1. 2. the substances made in chemical reactions
  2. 5. the joint of elements
  3. 8. the capacity of an atom to attract electrons
  4. 12. the basic unit of a chemical element.
  5. 14. the starting substances in chemical reactions
  6. 15. the ___ bond is when an element takes one electron from the ether
  7. 17. particles with negative and positive forces inside an atom
  8. 18. a ____ covalent bonding occurs when two octons share electrons equally
Down
  1. 1. attraction between elements
  2. 3. the ___ bond is when an element shares its electrons
  3. 4. a ____ covalent bonding is a bond between two atoms that share electrons unequality
  4. 6. nomencature system that uses the roman numbers to indicate the valence, avoids confusion
  5. 7. the chances od getting damaged or injured from hazards
  6. 9. substance that cannot be broken down
  7. 10. nomenclature system based on the number of atoms on each element, using greek prefixes
  8. 11. possible sources of danger
  9. 13. The oldest chemical nomenclature system, based on the names of the elements in latin
  10. 16. to calculate AE we use the scale of...