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Topic: Atomic and Ionic sizes  (Read 4662 times)

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Offline RydbergConstant

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Atomic and Ionic sizes
« on: October 26, 2007, 05:33:39 PM »
Which of the following shows an INCORRECT order of atomic and ionic sizes?
    S is smaller than P
    I is smaller than I-
    Sc3+ is smaller than Ca
    F is smaller than Cl
    Be2+ is smaller than Ca2+
    Cl- is smaller than K+
    Fe3+ is smaller than Fe2+
    Co3+ is smaller than Fe2+
    Si is smaller than Al
    Te is smaller than Sn


How do you do this??? Thanks
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Offline Borek

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Re: Atomic and Ionic sizes
« Reply #1 on: October 26, 2007, 05:43:48 PM »
Trends in periodic table.
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Offline RydbergConstant

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Re: Atomic and Ionic sizes
« Reply #2 on: October 26, 2007, 05:59:50 PM »
But wouldn't they cancel because the trends move in opposite directions.
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Offline agrobert

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Re: Atomic and Ionic sizes
« Reply #3 on: October 26, 2007, 06:09:32 PM »
A cation has a lost electron(s) and an anion has an extra electron(s).  Ionic size changes accordingly from atomic size depending on loss or addition.  Compare atomic size by periodic trends and ionic size  by noting that cations are smaller and anions are larger than their atomic size. 
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Offline Yggdrasil

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Re: Atomic and Ionic sizes
« Reply #4 on: October 26, 2007, 08:13:16 PM »
In what case do the trends move in opposite directions?
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