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NEETChemistryd and f Block Elements

What is the general trend in the hardness of lanthanoids with increasing atomic number?

Options

  1. AThe hardness decreases
  2. BThe hardness remains constant
  3. CThe hardness increases
  4. DThe hardness fluctuates randomly

Correct answer

C. The hardness increases

Step-by-step solution

The hardness increases with increasing atomic number, samarium being steel hard.

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