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It is a general point of view that in the absence of an external field, thenucleus of an atom is at the center of the electron cloud, so that all kinds ofatoms do not have permanent electric dipole moment (EDM). In the fact, the ideais untested. Using two special capacitors containing Potassium vapor wediscovered that the electric susceptibility Xe of K atoms is directlyproportional to the density N, and inversely to the temperature T, as polarmolecules. The experimental K material with purity 0.9995 is supplied by StremChemicals Co. USA. We have distinguished between permanent and induced dipolemoments carefully. There is good evidence that a ground state neutral K atom ispolar atom and has a large permanent EDM, d (K) =2.53\times10-29C.m. Newexample of time-reversal violation occurred in K atoms. Why has the linearStark effect of K atoms not been observed? The article discussed the questionthoroughly. The most linear Stark shift of K atoms is only 0.0041nm. It is sosmall, in fact, that a direct observation of the shifts is not possible! Theseresults can be repeated in other laboratories. Our experimental apparatus arestill kept, we welcome anyone who is interested in the experiments to visit andexamine it.

An important discovery - with no electric field, the center of the electron cloud of K atom does not coincide with the nucleus