The elements with atomic numbers 101 and 104 belong to, respectively :
Show Hint
- Group 6 and Actinoids
- Actinoids and Group 4
- Group 11 and Group 4
- Actinoids and Group 6
The Correct Option is B
Solution and Explanation
Z = 104 is rutherfordium (Rf), the next element after Lr, which fills 6d (configuration \([\mathrm{Rn}]5f^{14}6d^2 7s^2\)); it sits below Hf, in group 4.
So the elements belong to actinoids and group 4 respectively.
Answer: (2) Actinoids and Group 4
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