MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
In which period of the periodic table is lithium?
Think it through first, then pick an option.
- a 2nd
- b 3rd
- c 4th
- d 5th
Answer and explanation
Correct answer: a 2nd
Li(3) → 1s²2s¹, outer level 2.
Why the other options are wrong
- b 3rd: Period 3 holds Na, not Li. The answer is 2nd.
- c 4th: Period 4 holds K. The answer is 2nd: Li(3) → 1s²2s¹, outer level 2.
- d 5th: Period 5 holds Rb. The answer is 2nd: Li(3) → 1s²2s¹, outer level 2.
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