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Atoms and ions radius

  1. Jul 2, 2005 #1
    I am to arrange the following atoms or ions in order of increasing radius...then give an explanation for the position of S2- in relation to the atoms or ions that come before or after it.

    Here is what i have so far...in order of increasing radius.


    Now im not sure what they are looking for in an explanation on the rest.

  2. jcsd
  3. Jul 2, 2005 #2


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    What's your reasoning ?
  4. Aug 26, 2005 #3
    Hey msdel,

    I think you made a small mistake in arranging the particles in the increasing order of their radius. According to me, it should be :
    S2- / K+ ( of the same order )

    This is according to my knowledge. Any criticism is definitely welcome. Thanks.
  5. Apr 25, 2009 #4

    I am inexperienced with this topic aswell,
    but i just want to propose something...
    Since S-2 has 16 protons and needs to attract 18 electrons, the electrons are further away from the nucleus than they would be in the case of the Potassium ion K+ where 19 protons need to attract 18 electrons. The protons act as a magnet, and attract the electrons closer to the nucleus.

    Can anyone correct me, or contradict me? or am i right....

    My Answer:

    O, Cl, K+, S -2, K
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