atoms, molecules & compounds 3

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Across
  1. 3. Poor conductor element.
  2. 5. Horizontal row in periodic table.
  3. 6. Unstable atomic nucleus.
  4. 8. Shiny, conductive element.
  5. 10. Splitting of nucleus.
Down
  1. 1. How easily an atom reacts.
  2. 2. Reactive nonmetal group 17.
  3. 4. Has properties of both.
  4. 7. Breakdown of unstable atom.
  5. 9. Vertical column in periodic table.