Chemical bonds

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Across
  1. 5. an atom with a positive or negative charge due to the gain or loss of an electron
  2. 7. change in the chemical identity of a substance
  3. 9. ____ reaction absorbs energy
  4. 10. the links between atoms in a substance
  5. 11. groups of atoms held together by chemical bonds
Down
  1. 1. the chemical makeup of a substance
  2. 2. transfer electrons
  3. 3. the basic makeup of an element
  4. 4. share electrons
  5. 6. electrons the outermost electrons of an ion
  6. 8. ____ reaction releases energy, often in the form of heat