A. Actinoids
B. Nucleotides
C. Pre-actinum elements
D. Atomic elements
Correct Answer:
Option A – Actinoids
Explanation
The actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium.
The actinide series derives its name from the first element in the series, actinium.
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