MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
How many elements are in the actinide series?
Think it through first, then pick an option.
- a 32
- b 30
- c 18
- d 15
Answer and explanation
Correct answer: d 15
The 15 elements from 89 to 103 are the actinides.
Why the other options are wrong
- a 32: The whole of group 3 holds 32. The answer is 15.
- b 30: 30 is the two series together. The answer is 15.
- c 18: Periods 4 and 5 hold 18. The answer is 15.
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