According to University of Waterloo research, the half-life of benzene in soil/groundwater is between 10 - 720 days.
One of the radioactive substances with the longest half-life is thorium-232, with a half-life of about 14 billion years. Another example is uranium-238, which has a half-life of about 4.5 billion years.
The order of half-life from shortest to longest is: P32 (phosphorus-32), S35 (sulfur-35), C14 (carbon-14), and H3 (tritium).
For elements with no stable isotopes, the mass number of the isotope with the longest half-life is in parentheses.
For elements with no stable isotopes, the mass number of the isotope with the longest half-life is in parentheses.
The mass number of the isotope with the longest half life, Bh-270, is 270.
Uranium has the longest half-life element
One of the radioactive substances with the longest half-life is thorium-232, with a half-life of about 14 billion years. Another example is uranium-238, which has a half-life of about 4.5 billion years.
Haldol is a benzo. Benzos tend to stay in your system much longer than other drugs (like dilaudid) because they have a long half life.
I believe it is selenium 82 with a half life of 1.3*10 to the 20 years or 130 quintillion years!
Phosphorus, iron, and iodine all have at least one isotope that is stable, and any of these would do for the longest half life. In fact, the radioactive isotopes of phosphorus are all synthetic, so radioactive phosphorus is not found in nature.
The longest-lived isotope currently known is 289Fl with a half-life of ~2.6 s, although there is evidence for a nuclear isomer, 289bFl, with a half-life of ~66 s, that would be one of the longest-lived nuclei in the super-heavy element region.
Tungsten 184 has a half life of nearly 9 sextillion years - which is several trillion times the age of the universe.
Ununquadium is still being explored. There are 5 confirmed isotopes, and what looks looks two isomers. The longest half-life appears to be 114289Uuq at 2.6 seconds, and the longest isomer appears to be 114289mUuq at 1.2 minutes.
Klonopin is a benzo They have a long half life. for at least a couple weeks
the longest-lived isotope has lived just 61 ms.
Rutherfordium has 104 protons; the isotope with the longest half-life (263Rf) has 159 neutrons.
The longest half life for a seaborgium isotope is a little more than 2 minutes.