WAEC Chemistry 2013 Objective — Question 10

Question 10 of 50 from the West African Examinations Council (WAEC) Chemistry 2013 Objective paper, with the correct answer and a full explanation.

Rare gases are stable because they

A. are chemically active
B. contain equal number of protons and neutrons
C. contain more electrons than protons
D. have octet structuresCorrect

Explanation

Rare gases are stable because they have stable electronic structure. Except helium (which maintains a satisfactory duplet structure), noble gases have octet structures. They owe their chemical inactivity to the stable structures.

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