Question:
Identify the series of elements so that all the elements in it are radioactive in nature.
Identify the series of elements so that all the elements in it are radioactive in nature.
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Only one of the given series has every member with an unstable nucleus.
Updated On: Nov 12, 2026
- Lanthanide
- Actinoids
- p block elements
- Transition elements
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
A radioactive element has an unstable nucleus that decays by emitting radiation.
Step 2: Compare the series
Lanthanoids are mostly stable; only promethium is radioactive.
The p-block and the d-block (transition) series contain mostly stable elements, with only a few exceptions such as Po, At, Rn and Tc.
Step 3: Actinoids
All elements from actinium to lawrencium are radioactive, and those after uranium are man-made.
So the actinoid series is the one in which every element is radioactive.
Final Answer:
The actinoid series has all its elements radioactive. \[ \boxed{\text{(B) }\text{Actinoids}} \]
A radioactive element has an unstable nucleus that decays by emitting radiation.
Step 2: Compare the series
Lanthanoids are mostly stable; only promethium is radioactive.
The p-block and the d-block (transition) series contain mostly stable elements, with only a few exceptions such as Po, At, Rn and Tc.
Step 3: Actinoids
All elements from actinium to lawrencium are radioactive, and those after uranium are man-made.
So the actinoid series is the one in which every element is radioactive.
Final Answer:
The actinoid series has all its elements radioactive. \[ \boxed{\text{(B) }\text{Actinoids}} \]
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