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.

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