Question

Question #eb982

Answer 1

`"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

`"Group" color(white)(ml)1color(white)(m)18`
`stackrel(——————)("Row 5" color(white)(m)"Rb"color(white)(m)"I")`
`"Row 6" color(white)(m)"Cs"color(white)(ll)"At"`

`"Cs"` is in the lower left of your table, so it has the largest radius.