Untriseptium

Untriseptium (IPA: /ʌntrʌɪˈsɛptiəm/) is an chemical element which has not yet been observed to occur natually or be synthesised. Its atomic number is 137 and symbol is Uts.

The name untriseptium is a temporary IUPAC systematic element name.

1 History
2 Significance
3 External links
4 See also

[edit] History

The name untriseptium is used as a placeholder, as in scientific articles about the search for element 137. Transuranic elements (those beyond uranium) are, except for microscopic quantities, always artificially produced, and usually end up being named for a scientist or the location of a laboratory that does work in atomic physics (see systematic element name for more information).

[edit] Significance

In a non-relativistic approximation, the speed of an electron in a 1s electron orbital, v, can be obtained using the expression:

$v = Z \alpha c = \frac{Z c}{137.036}$

where Z is the atomic number, and α is the fine structure constant, a measure of the strength of electromagnetic interactions. Under this approximation, any element with an atomic number of greater than 137 would require 1s electrons to be traveling faster than c, the speed of light.

A complete analysis involving relativity reduces the speed of electrons, therefore allowing stable 1s orbits in the element 138 (Uto).

Because this paradox was first pointed out by the physicist Richard Feynman, element 137 is sometimes nicknamed feynmanium.

[edit] External links

Feynman Online - Describes why element 137 is the last classically stable element.
Likely properties of Untriseptium
Extended Periodic Table

[edit] See also

Dubnium
Eka-Rutherfordium — Eka-Dubnium — Eka-Seaborgium
Untrihexium – Untrioctium

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Categories: Chemical elements | Nuclear physics

Untriseptium

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[edit] Significance

[edit] External links

[edit] See also

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