Recent discoveries in the isotope chemistry are presented and discussed. In addition to classic mass (or vibration) isotope shift, the nuclear field shift must be taken into consideration. The direction of nuclear field shift can be opposite to that of mass effect and its absolute value can be higher. The nuclear field shifts influence the values of the separation factors of the even-odd, isotope pairs as well as those of even-even isotope pairs (even and odd refer to the number of neutrons in these nuclides). The impact of the new ideas to the understanding of isotope chemistry of the heavier elements is discussed from the historical perspective.
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