WAEC Chemistry 2010 Objective — Question 4
Question 4 of 49 from the West African Examinations Council (WAEC) Chemistry 2010 Objective paper, with the correct answer and a full explanation.
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Which of the following noble gases has electronic structure similar to that of N in NH3? [¹⁴₇N]
- A. A. ₂He
- B. B. ₁₀NeCorrect
- C. C. ₁₈Ar
- D. D. ₃₆Kr
Explanation
Nitrogen has the structure '2, 5' originally. When it combines covalently with hydrogen to form ammonia, NH3, the outermost shell now has eight electrons and the structure becomes '2, 8' just like neon.
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