Question #eb982

1 Answer
Ernest Z.
Sep 14, 2016

#"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.

Atomic radii
(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.

Related questions
See all questions in Periodic Trends in Atomic Size
Impact of this question
2376 views around the world
You can reuse this answer
Creative Commons License