Uranium-238, the most prevalent isotope of uranium, has a half-life of 4.46 billion years. This means that in 4.46 billion years, only half of the uranium would have decayed. Uranium-235 and Uranium-234 have half-lives of 704 million and 245,000 years, respectively.Know More
Uranium-238 atoms make up 99.3 percent of all the uranium on Earth. Uranium-235 makes up 0.7 percent, and uranium-234 is found only in negligible amounts. Half the atoms of an original sample of uranium-238 becomes thorium-234 after 4.46 billion years; the other half of the sample remains uranium-238. Thorium-234 also is radioactive and is thus called a decay product.
When uranium atoms decay, they emit radioactive alpha particles. Because uranium-238 takes so long to decay, it does not emit too many alpha particles at one time and is not very radioactive. Uranium-235 and uranium-234 have shorter half-lives, which make them more radioactive.Learn more in Atoms & Molecules
Uranium was discovered by a German chemist named Martin Heinrich Klaproth in 1789. Klaproth discovered uranium in pitchblende, a mix of uranium oxides, believing it to be pure uranium. It was later determined that he had discovered uranium dioxide.Full Answer >
The electron configuration of uranium is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f3 6s2 6p6 6d1 7s2. Condensed, the standard electron configuration can be abbreviated as [Rn] 5f3 6d1 7s2 to denote only those levels with valence electrons.Full Answer >
The formula for a half-life is T1/2 = ln(2) / λ. In this equation, T1/2 is the half-life. The ln(2) stands for the natural logarithm of two and can be estimated as 0.693, and the λ is the decay constant.Full Answer >
ATP, or adenosine triphosphate, is the molecule that can be considered to perform the work of life. It is necessary in many cellular and biological processes, including motility, cell division and biosynthetic reactions.Full Answer >