Isotopes of mercury

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There are seven stable isotopes of mercury (80Hg) with 202Hg being the most abundant (29.74%). The longest-lived radioisotopes are 194Hg with a half-life of 447 years, and 203Hg with a half-life of 46.61 days. Most of the remaining 40 radioisotopes have half-lives that are less than a day.

Excerpt from the Wikipedia article “Isotopes of mercury”, under the CC BY-SA 4.0 license. Read the article on Wikipedia