MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
In which period is the element ₁₉X?
Think it through first, then pick an option.
- a 1
- b 3
- c 4
- d 5
Answer and explanation
Correct answer: c 4
19 → ...4s¹, outer level 4 (K).
Why the other options are wrong
- a 1: Period 1 holds only H and He. The answer is 4.
- b 3: Period 3 ends at Ar (18). The answer is 4.
- d 5: Period 5 starts at 37. The answer is 4: 19 → ...4s¹, outer level 4 (K).
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