Which of the following gives the correct increasing order of the atomic radii of O, F and N?
O, F, N
N, F, O
O, N, F
F, O, N

Correct answer: (d) F, O, N

Explanation: The increasing order of the atomic radii of oxygen, fluorine, and nitrogen is fluorine, oxygen, and nitrogen. This is because the atomic radius decreases from left to right in a period.