WAEC Chemistry 2014 Objective — Question 6

Question 6 of 50 from the West African Examinations Council (WAEC) Chemistry 2014 Objective paper, with the correct answer and a full explanation.

Which of the following arrangements is in decreasing order of atomic radius?

A. Li > Be > C > B
B. Li > B > Be > C
C. Li > Be > B > CCorrect
D. C > B > Be > Li

Explanation

Atomic radius decreases across a period and increases down a group. Since lithium, beryllium, and carbon are all in period 2, the order from largest to smallest atomic radius is Li > Be > B > C.

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