Question

2
use the periodic table to rank the blue elements from smallest to largest. * (0.5 points)
h
li
na
ca
rb
sr
b
al
si
n
o
f
se
br
i

Explanation:

Step1: Recall atomic radius trend

Atomic radius decreases across a period (from left to right) and increases down a group in the periodic table.

Step2: Analyze positions of Se, Br, I

Se and Br are in the same period (period 4), with Se to the left of Br. So, atomic radius of Se > Br. I is in period 5 (below Br). So, atomic radius of I > Br. Also, since I is below Se (period 5 vs period 4), atomic radius of I > Se.

Answer:

Br < Se < I