Examples of isotopes used in radiometric dating
Examples of isotopes used in radiometric dating - Webcam sex without sign up
It is malleable, ductile, slightly paramagnetic, strongly electropositive and a poor electrical conductor.
If too many of these neutrons are absorbed by other uranium-235 nuclei, a nuclear chain reaction occurs that results in a burst of heat or (in special circumstances) an explosion.
A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons.
Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years.
Research by Otto Hahn, Lise Meitner, Enrico Fermi and others, such as J.
Robert Oppenheimer starting in 1934 led to its use as a fuel in the nuclear power industry and in Little Boy, the first nuclear weapon used in war.
An ensuing arms race during the Cold War between the United States and the Soviet Union produced tens of thousands of nuclear weapons that used uranium metal and uranium-derived plutonium-239.
The security of those weapons and their fissile material following the breakup of the Soviet Union in 1991 is an ongoing concern for public health and safety.
Uranium-238 is fissionable by fast neutrons, and is fertile, meaning it can be transmuted to fissile plutonium-239 in a nuclear reactor.
Another fissile isotope, uranium-233, can be produced from natural thorium and is also important in nuclear technology.
Uranium is a chemical element with symbol U and atomic number 92.
It is a silvery-white metal in the actinide series of the periodic table.
Its density is about 70% higher than that of lead, and slightly lower than that of gold or tungsten.