MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
Which is the last element of period 2?
Think it through first, then pick an option.
- a He
- b Ne
- c Ar
- d Kr
Answer and explanation
Correct answer: b Ne
Ne(10) → 2s²2p⁶, period 2, group 18.
Why the other options are wrong
- a He: He ends period 1. The answer is Ne: Ne(10) → 2s²2p⁶, period 2, group 18.
- c Ar: Ar ends period 3. The answer is Ne: Ne(10) → 2s²2p⁶, period 2, group 18.
- d Kr: Kr ends period 4. The answer is Ne: Ne(10) → 2s²2p⁶, period 2, group 18.
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