chemical bonds

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Across
  1. 5. the # and type of atom in the molecule
  2. 7. reaction happens when chemical bonds give off heat
  3. 9. each shell around the nucleus contains a specific number of ______.
  4. 10. Transfer valence electrons
Down
  1. 1. Share valence electrons
  2. 2. a new substance is formed from a chemical reaction.
  3. 3. electrons in the outer shell are called?
  4. 4. groups of atoms held together by chemical bonds.
  5. 6. transfer or share electrons to for a full outer shell
  6. 8. are very small and made up of small molecules.