Why does francium has higher ionisation energy than caesium?

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Maya

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Maya asked the Naked Scientists:
   
Why does francium has higher ionisation energy than caesium?

What do you think?
« Last Edit: 23/10/2010 09:30:12 by _system »

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Offline chris

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Why does francium has higher ionisation energy than caesium?
« Reply #1 on: 30/10/2010 13:27:13 »
This is some sort of quantum mechanical effect. I'll need to remind myself exactly what...

C
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Offline Atomic-S

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Why does francium has higher ionisation energy than caesium?
« Reply #2 on: 21/01/2011 06:22:16 »
Could it have anything to do with the way the fill order of electron orbits is affected by the shifting charge distribution as the atomic number increases?