MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
Lanthanum is an element of which period?
Think it through first, then pick an option.
- a 4
- b 5
- c 6
- d 7
Answer and explanation
Correct answer: c 6
La (57) begins the lanthanides, period 6.
Why the other options are wrong
- a 4: Period 4, group 3 is Sc. The answer is 6.
- b 5: Period 5, group 3 is Y. The answer is 6.
- d 7: Period 7 holds the actinides. The answer is 6.
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