Chemical Bonds

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Across
  1. 2. ________ electrons are the electrons in the outermost shell.
  2. 5. A ______ reaction occurs when chemical bonds give off heat.
  3. 6. Groups of atoms held together with chemical bonds.
  4. 7. A ______ can occur when chemical bonds are built or broken.
  5. 8. shows the number and types of atoms presented in an atom, using atomic symbols and numerical subscripts.
  6. 10. formed with oppositely charged ions.
Down
  1. 1. The sharing of two or more electrons.
  2. 3. A _______ reaction occurs when chemical bonds absorb heat.
  3. 4. when one chemical substance is transformed into one or more different substances.
  4. 9. An ______ contains three basic particles - protons, neutrons, and electrons.