1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

2 questions about ionic bonding

  1. Jun 4, 2008 #1
    1. Why do anions, such as the chloride anion, increase in size when they achieve a full valence electron shell? This does not make sense to me because there is no new shell that is added.
    2. How would you name ionic compunds involving polyatomic ions? My book says that (NH4)2CO3 would be ammonium carbonate. This also does not make sense to me because ammonium is not a metal , so there is no reason that it should go first.

    Thanks for the help!
     
  2. jcsd
  3. Jun 4, 2008 #2
    1. There's an increased electron-electron repulsion due to the extra negative charge, thus more repulsion and increased atomic size.
    2. I think you're thinking "ionic" too specifically to only "metal" ions. Cations are normally metals, but not all of them. Normally, naming ionic compounds with radicals are just simply naming the cation, (the charge if its multivalent), and the anion after it; it has nothing to do with metals or gases. And that's how ammonium carbonate should be named, so there's nothing wrong with the textbook.

    Hope it helps~! =)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: 2 questions about ionic bonding
  1. Ionic bonds (Replies: 1)

Loading...