Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Atomic radius

  1. Nov 20, 2006 #1
    which atom has a larger atomic radius: K+ or Ar ?
  2. jcsd
  3. Nov 22, 2006 #2


    User Avatar
    Science Advisor

    Both have the same number of electrons, but think about the number of protons in the nucleus of the K+ ion and in the Argon atom. How will the number of protons affect the atomic (or ionic) radius? Think of the general periodic trend of atomic radii when the outermost shell is the same but atomic number is increasing.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook