chemical bonds

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Across
  1. 3. a formula that shows how many atoms are in each element
  2. 7. a _______ reaction occurs when chemical bonds give off heat
  3. 8. type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound.
  4. 9. a ______ reaction occurs when chemical bonds absorb heat
  5. 10. links between atoms in a substance that determine its identity
Down
  1. 1. changing new substances that are different than the original substance
  2. 2. the sharing of two or more electrons
  3. 4. _________ electrons are the electrons in the outermost shell
  4. 5. group of atoms held together by chemical bonds
  5. 6. contain three basic particles, protons, neutrons, and electrons