Periodic element

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Across
  1. 4. A white metal used in making jewelleries
  2. 5. A gas that is essential for respiration
  3. 6. This element is found in chalk, limestone, and the human bones
  4. 8. An element with atomic number 50
  5. 9. A metal that is liquid at room temperature
  6. 10. This element’s symbol is 'Au'
Down
  1. 1. The lightest element
  2. 2. A noble gas used in balloons
  3. 3. A metal used in batteries
  4. 4. This element belongs to first group and third period
  5. 7. This element is used in pencils