MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
How many elements are in the lanthanide series?
Think it through first, then pick an option.
- a 14
- b 15
- c 17
- d 18
Answer and explanation
Correct answer: b 15
The 15 elements from 57 to 71 are the lanthanides.
Why the other options are wrong
- a 14: Not 14; counting 57 to 71 gives 15. The answer is 15.
- c 17: No series of 17 is in the book. The answer is 15.
- d 18: Periods 4 and 5 hold 18. The answer is 15.
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