Actinides
All actinides are:
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About This Question
- Subject
- chemistry
- Chapter
- d- and f-block elements
- Topic
- actinides
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Radioactive
Actinides (5f series, from Th to Lr) are elements with high atomic numbers.
- Characteristic: All actinides are radioactive.
- Nuclei are unstable and undergo spontaneous decay. While early members like Thorium (Th) and Uranium (U) have long half-lives and occur in nature, the later members are synthetic (transuranium elements) and extremely short-lived.
This easy difficulty chemistry question is from the chapter d- and f-block elements, covering the topic of actinides. It appeared in the 2025 exam.
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