Atomic Structure, Periodic Table & Reactivity of Metals

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Across
  1. 4. Negatively charged particle
  2. 6. Most reactive metal in reactivity series
  3. 8. Gas released when metal reacts with acid
  4. 9. An inert metal that resists corrosion
Down
  1. 1. Metals form these when they react with oxygen
  2. 2. Vertical columns in periodic table
  3. 3. Horizontal rows in periodic table
  4. 5. Subatomic particle with a positive charge
  5. 7. The symbol for this element is Pb