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Response to NNadir (Reply #2)

Sat Feb 24, 2018, 06:51 PM

3. Hey, you jumped ahead to the punch line ! :D

I've always wanted to find a real-life situation into which I could drop that quote. But there's that risk that anyone who is likely to get the joke has probably already heard it ...

(To split hairs: the speed of a core electron is predicted to exceed c only in a non-relativistic Bohr model; in the Dirac equation it approaches infinitesimally closer as Z increases. There's a famous quote that the Schrodinger equation tells us everything there is to know about chemistry, if only we knew how to solve it. In fact that would only be true in a non-relativistic universe ! In our real universe we need to solve the Dirac equation.)
(I read once -- don't have the reference at hand, sad to say -- that above a certain Z the electric field gradient at the surface of the nucleus becomes so great that electron-positron pairs can be created from the vaccuum without further energy input. The positron gets ejected, while the electron combines with a proton in the nucleus. So this is the ultimate upper limit to nuclear charge, apparently. Maybe around 173(?) but as I say I'm working from an old memory.)

That Dutch article was probably around the same level as this review by Pyykkö: https://www.annualreviews.org/doi/abs/10.1146/annurev-physchem-032511-143755 , so maybe there's nothing new there for you. (Pyykkö was the one who predicted that Oganesson (eka-Radon) would form a stable anion).

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NNadir Feb 2018 OP
eppur_se_muova Feb 2018 #1
NNadir Feb 2018 #2
LineLineLineNew Reply Hey, you jumped ahead to the punch line ! :D
eppur_se_muova Feb 2018 #3
NNadir Feb 2018 #4
eppur_se_muova Feb 2018 #5
NNadir Mar 2018 #6
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