Natural mercury consists of a mixture of seven stable isotopes with mass numbers Hg-196, Hg-198, Hg-199, Hg-200, Hg-201, Hg-202 and Hg-204. The heaviest isotope is the most common: its share is almost 30%, more precisely, 29.8. The second most common is the isotope mercury Hg-200 (23.13%). And least of all in the natural mixture of mercury Hg-196 - only 0.146%.
Composition of natural mercury from a mixture of stable isotopes:
- Hg-196 (isotopic prevalence* 0.155%)
- Hg-198 (isotopic prevalence* 10.04 %)
- Hg-199 (isotopic prevalence* 16.94 %)
- Hg-200 (isotopic prevalence* 23.14%)
- Hg-201 (isotopic prevalence* 13.17%)
- Hg-202 (isotopic prevalence* 29.74%)
- Hg-204 (isotopic prevalence* 6.82 %)
Of the radioactive isotopes of element No. 80, and 11 of them are known, only mercury Hg-203 (half-life of 46.9 days) and mercury Hg-205 (5.5 minutes) have acquired practical significance. They are used in analytical definitions of mercury and the study of its behavior in technological processes.
Isotopic prevalence* - is the relative number of atoms of different isotopes of one chemical element; usually expressed as % of the sum of atoms of all long-lived isotopes of this element on average in nature (or with reference to a particular natural environment, planet, region, etc.). Accurate measurement of isotopic prevalence is of great importance for determining the atomic masses of elements.