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MHT CET202120 Sep 2021Morning ShiftChemistryd and f Block ElementsActual

Which among following properties of lanthanoids is NOT true?

Options

  1. AThese are good conductors of heat and electricity
  2. BThese are strongly paramagnetic
  3. CThese all are non-radioactive
  4. DThese have coordination number greater than 6

Correct answer

C. These all are non-radioactive

Step-by-step solution

The promethium Pm has an atomic number of 61 . The electronic configuration of promethium is as follows: Pm =[ Xe ] 4 f ^5 6 ~s ^2 Promethium (Pm) is the only lanthanide that exhibits radioactivity

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