Question : The actinide series is a group of ______ metallic chemical elements.
Option 1: 12
Option 2: 15
Option 3: 9
Option 4: 18
Correct Answer: 15
Solution : The correct answer is 15 .
The actinide series is a group of 15 metallic chemical elements. This series is named after the first element in the series, which is actinium, and the last element in the series is lawrencium. The actinide series contains elements with atomic numbers from 89 to 103. These elements are radioactive and are placed in the third group of the periodic table.
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