CHEMISTRY

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Across
  1. 3. table in which the elements are described
  2. 5. substance that cannot be broken down into other substances
  3. 6. element with atomic number of 26
  4. 7. strong, stable bond of shared electrons
  5. 9. center of an atom
  6. 10. a chemical combination, in a fixed ratio, of two or more elements
Down
  1. 1. atoms of an element that possess different numbers of neutrons; unstable, give off energy, can be used for tracking
  2. 2. weak bonds between atoms in 2 different molecules; formed when hydrogen atom (that is covalently bonded to a more electronegative atom) is attracted to an electronegative atom of another molecule
  3. 4. negative particle
  4. 8. neutral particle
  5. 11. positive particle