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MHT CET202617 April 2026Evening ShiftChemistryd and f Block ElementsActual

What is the atomic number of first post actinoid element ?

Options

  1. A101
  2. B108
  3. C104
  4. D110

Correct answer

C. 104

Step-by-step solution

The actinoid series consists of elements with atomic numbers from 90 to 103 . The elements that follow the actinoid series are known as post-actinoid elements. Therefore, the first post-actinoid element has an atomic number of 104 , which is Rutherfordium (Rf). Answer: 104

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