Place the following in order of increasing atomic radius.
As O Br
A)As

Question

Place the following in order of increasing atomic radius.
As O Br
A)As < Br < O
B)O < As < Br
C)Br < As < O
D)As < O < Br
E)O < Br < As

Quizplus · Accepted Answer

The atomic radius increases as one moves down a group in the periodic table and decreases as one moves across a period from left to right. Oxygen (O) is located to the right of bromine (Br) and arsenic (As) in the same period, so it has the smallest atomic radius. Bromine has a larger atomic radius than oxygen because it is located farther down the same group. Arsenic has the largest atomic radius of the three because it is located below bromine in a different period. Therefore, the correct order of increasing atomic radius is O < Br < As, which corresponds to answer choice E.

Place the Following in Order of Increasing Atomic Radius