Isotopes of ununhexium
Encyclopedia
Ununhexium
(Uuh) is an artificial element, and thus a standard atomic mass
cannot be given. Like all artificial elements, it has no stable isotope
s. The first isotope
to be synthesized was 293Uuh in 2000. There are four known radioisotopes from 290Uuh to 293Uuh. The longest-lived isotope is 293Uuh with a half-life
of 53 ms.
Ununhexium
Ununhexium is the temporary name of a synthetic superheavy element with the temporary symbol Uuh and atomic number 116. There is no proposed name yet although moscovium has been discussed in the media.It is placed as the heaviest member of group 16 although a sufficiently stable isotope is...
(Uuh) is an artificial element, and thus a standard atomic mass
Atomic mass
The atomic mass is the mass of a specific isotope, most often expressed in unified atomic mass units. The atomic mass is the total mass of protons, neutrons and electrons in a single atom....
cannot be given. Like all artificial elements, it has no stable isotope
Stable isotope
Stable isotopes are chemical isotopes that may or may not be radioactive, but if radioactive, have half-lives too long to be measured.Only 90 nuclides from the first 40 elements are energetically stable to any kind of decay save proton decay, in theory...
s. The first isotope
Isotope
Isotopes are variants of atoms of a particular chemical element, which have differing numbers of neutrons. Atoms of a particular element by definition must contain the same number of protons but may have a distinct number of neutrons which differs from atom to atom, without changing the designation...
to be synthesized was 293Uuh in 2000. There are four known radioisotopes from 290Uuh to 293Uuh. The longest-lived isotope is 293Uuh with a half-life
Half-life
Half-life, abbreviated t½, is the period of time it takes for the amount of a substance undergoing decay to decrease by half. The name was originally used to describe a characteristic of unstable atoms , but it may apply to any quantity which follows a set-rate decay.The original term, dating to...
of 53 ms.
Table
| nuclide symbol |
Z(p Proton The proton is a subatomic particle with the symbol or and a positive electric charge of 1 elementary charge. One or more protons are present in the nucleus of each atom, along with neutrons. The number of protons in each atom is its atomic number.... ) |
N(n Neutron The neutron is a subatomic hadron particle which has the symbol or , no net electric charge and a mass slightly larger than that of a proton. With the exception of hydrogen, nuclei of atoms consist of protons and neutrons, which are therefore collectively referred to as nucleons. The number of... ) |
isotopic mass (u) |
half-life | decay mode(s) | daughter isotope(s) |
nuclear spin |
|---|---|---|---|---|---|---|---|
| 290UuhNot directly synthesized, created as decay product Decay product In nuclear physics, a decay product is the remaining nuclide left over from radioactive decay. Radioactive decay often involves a sequence of steps... of 294Uuo |
116 | 174 | 290.19859(91)# | 15(+26-6) ms | α | 286Uuq | 0+ |
| 291Uuh | 116 | 175 | 291.20001(91)# | 6.3(+116-25) ms | α | 287Uuq | |
| 292Uuh | 116 | 176 | 292.19979(92)# | 18.0(+16-6) ms | α | 288Uuq | 0+ |
| 293Uuh | 116 | 177 | unknown | 53(+62-19) ms | α | 289Uuq |