Reactivity of metals

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Across
  1. 3. - most reactive metal
  2. 5. - A metal with very High electrical conductivity,used in wiring
  3. 6. heavy metal used in car batteries and shielding against radiation
Down
  1. 1. - A precious metal used in jewelry,it's one of the least reactive metal
  2. 2. this metal is more reactive then iron but less reactive than aluminium
  3. 4. metal that reacts vigorously with water even at room temperature