how can you know stuff but not understand

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Offline geo driver

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how can you know stuff but not understand
« on: 18/11/2009 12:00:03 »
ok no i now hydregen i know hangs around in pairs H but helium does not, this is because of the energy it takes too much energy to make dihelium.

this i know but i dont understand
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Offline Nizzle

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how can you know stuff but not understand
« Reply #1 on: 24/11/2009 08:44:53 »
It has to do with filling orbitals.
The Hydrogen atoms have 1 electron, but need 2 to fill their K shell (which only has an s-orbital with 2 electron vacancies), so they pair up and both Hydrogen atoms share their electrons so they've both filled their K shell.

Helium however is quite happy on it's own, because it already has 2 electrons and thus fills it's K shell on it's own.
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Offline geo driver

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how can you know stuff but not understand
« Reply #2 on: 24/11/2009 08:55:45 »
an ephany cheers

the text i was reading was alittle unclear....
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