Q131 / 200 · MHT CET - Medical 2026 (25 April Shift 1) · Chemistry
Identify the series of elements so that all the elements in it are radioactive in nature.
- ALanthanide
- Correct answerBActinoids
- Cp block elements
- DTransition elements
Solution
Actinoids are the series of elements with atomic numbers from $89$ to $103$. All the elements in the actinoid series are radioactive in nature.
In contrast, only promethium ($Pm$) is radioactive among the lanthanides. The p-block and transition elements contain both stable and radioactive elements.
Answer: Actinoids
In contrast, only promethium ($Pm$) is radioactive among the lanthanides. The p-block and transition elements contain both stable and radioactive elements.
Answer: Actinoids
Hence, the correct answer is option: 'B'.