# Question eb982

Sep 14, 2016

$\text{Cs}$ has the largest atomic radius.

#### Explanation:

Remember two principles:

• Atomic radius increases from right to left across a Row in the Periodic Table
• Atomic radius increases from top to bottom in a Group.

So, the biggest atoms are at the lower left of the Periodic Table.

(From chemistryhungergames.com)

Now, let's create a mini-Periodic Table using just the atoms in your problem.

We get

$\text{Group} \textcolor{w h i t e}{m l} 1 \textcolor{w h i t e}{m} 18$
stackrel(——————)("Row 5" color(white)(m)"Rb"color(white)(m)"I")#
$\text{Row 6" color(white)(m)"Cs"color(white)(ll)"At}$

$\text{Cs}$ is in the lower left of your table, so it has the largest radius.