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Topic: why ionic radius of K+ > Ca2+?  (Read 8806 times)

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Offline e_w

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why ionic radius of K+ > Ca2+?
« on: October 02, 2009, 10:13:52 PM »
why ionic radius of K+ > Ca 2+?
they have the same electronic configuration!!
 ??? ???
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Offline UG

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Re: why ionic radius of K+ > Ca2+?
« Reply #1 on: October 02, 2009, 10:21:41 PM »
Yes, but potassium has 19 proton, calcium has 20. As a result there is greater nuclear attraction on the outer electrons, drawing them closer to the nucleus.
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Offline leela sriram

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Re: why ionic radius of K+ > Ca2+?
« Reply #2 on: October 25, 2009, 03:57:24 PM »
as positive charge increases decrease in the atomic radii, because of increased  nuclear attraction
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