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Topic: why H has a smaller atomic radius than He  (Read 2610 times)

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Offline alexanda

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why H has a smaller atomic radius than He
« on: August 11, 2014, 05:21:06 AM »
For period 2,3 and4, atomic radius decreases from metals to non metals and it is because the nuclear charge rises gradually

But why He has a larger atomic radius than H instead of smaller?shielding effect between H and He has no change

Offline Ben Bob2

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Re: why H has a smaller atomic radius than He
« Reply #1 on: August 11, 2014, 11:30:53 AM »
There are conflicting views of which radius is greater, due to the difficulty of measuring helium's radius (as it does not form many stable compounds).

http://www.physicsforums.com/showthread.php?t=719342
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Offline alexanda

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Re: why H has a smaller atomic radius than He
« Reply #2 on: August 11, 2014, 10:19:07 PM »
Okay thx a lot!

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