Which one of the following metals has both malleability and ductility properties:

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CDS GK Previous Paper 11 (Held On: 7 Feb 2021)
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  1. Na
  2. Au
  3. Ce
  4. Hg

Answer (Detailed Solution Below)

Option 2 : Au
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The correct answer is Au.

Key Points

  • Gold is element 79 and its symbol is Au.
  • The name is Anglo Saxon, gold originated from the Latin Aurum, or shining dawn, and previously from the Greek.
  • It's abundance in the earth's crust is 0.004 ppm. 100% of gold found naturally is isotope Au-197.
  • Gold is the most malleable of all metals. It can be drawn into a wire of single-atom width, and then stretched considerably before it breaks.
  • Gold has only one stable isotope, 197 Au, which is also its only naturally occurring isotope, so gold is both a mononuclidic and monoisotopic element.

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Additional Information

Properties of gold.
Chemical formula Au
Atomic Number (Z) 79
Group, Period and block Group 11, 6th period, d-block
Electronic Configuration [Xe] 4f14 5d10 6s1
Electron per shell 2, 8, 18, 32, 18, 1
Density 19.30 g/cm3
Boiling Point 3243 K
Melting Point 1337.33 K
Crystal structure Face-centred cubic

 

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