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BITSAT2018Chemistryd and f Block ElementsActual

Which among the following actinoids does not have stable electronic configuration

Options

  1. AProtactinium
  2. BNobelium
  3. CAmericium
  4. DLawrencium

Correct answer

A. Protactinium

Step-by-step solution

Protactinium Pa is the element that does not have stable electronic configuration. Protactinium Pa = Rn 5 f 2 6 d 1 7 s 2 (Atomic number = 91 ) Nobelium No = Rn 5 f 14 6 d 0 7 s 2 (Atomic number = 102 ) Lawrencium Lr = Rn 5 f 14 6 d 1 7 s 2 (Atomic number = 103 ) Americium Am = Rn 5 f 7 6 d 0 7 s 2 (Atomic number = 95 )

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