Chemistry
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118 Is a negative pH level physically possible? Jul 31 '13
64 If nothing sticks to Teflon, how does Teflon stick to frying pans? Apr 26 '12
60 How can one explain niobium’s weird electronic configuration? Oct 29 '12
56 Striking examples where Kohn-Sham orbitals clearly have no physical meaning Mar 16 '12
52 What makes some metals melt at higher temperature? Apr 28 '12
51 Can an atom have more than 8 valence electrons? If not, why is 8 the limit? May 18 '12
40 Bonding in diatomic C2, a carbon-carbon quadruple bond? Aug 27 '12
39 Why does sulfur, but not oxygen, catenate? May 17 '12
38 Why is the vanadium(3+) ion paramagnetic? Apr 28 '12
32 Why do impurities lower the melting point of an isolated substance? Apr 25 '12
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