Atoms and the periodic table

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Across
  1. 2. Regions where electrons are arranged around the nucleus
  2. 4. Neutral particle in the nucleus
  3. 7. Element that conducts electricity and is malleable
  4. 8. Vertical column in the periodic table
  5. 9. Positively charged particle in the nucleus
Down
  1. 1. Negatively charged particle orbiting the nucleus
  2. 3. Smallest unit of matter
  3. 4. Element that is brittle and a poor conductor
  4. 5. Horizontal row in the periodic table
  5. 6. Substance made of two or more different elements chemically bonded