Experimental B(E2; 01+→21+) values for 54 even‐even nuclei in the range A=90–200 were used to deduce effective charges of proton, neutron bosons. The results indicate that for deformed nuclei, the ratio en/epis in general agreement with the schematic Bohr and Mottelson prediction. For vibrational nuclei in the A=100 and A=140 regions a very significant enhancement of this ratio is found.