All radioactive elements are present in which of the following _____.
Q.1 (viii) All radioactive elements are present in which of the following _____.
A. 3d series
B. 4d series
C. Actinoid series
D. Lanthanoid series
1 answer
Best answer
Answer: C. Actinoid series
Answer: (c) Actinoid series
All the actinoids (Ac to Lr) are radioactive. Among the other series only a few elements (Tc in 4d, Pm among the lanthanoids) are radioactive.
Doubtly AI
· 28 Oct 2026
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