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transactinide elements


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Elements with an atomic number greater than 103, i.e. elements above lawrencium in the periodic table. So far, elements up to 116 have been detected. Because of the highly radioactive and transient nature of these elements, there has been much dispute about priority of discovery and, consequently, naming of the elements. The International Union of Pure and Applied Chemistry (IUPAC) introduced a set of systematic temporary names based on affixes, as shown in the table. All these element names end in -ium. So, for example, element 109 in this system is called un+nil+enn+ium, i.e. unnilennium, and given the symbol u+n+e, i.e. Une.

One long-standing dispute was about the element 104 (rutherfordium), which has also been called kurchatovium (Ku). There have also been disputes between IUPAC and the American Chemical Union about element names. In 1994 IUPAC suggested the following list: mendelevium (Md, 101)nobelium (No, 102)lawrencium (Lr, 103)dubnium (Db, 104)joliotium (Jl, 105)rutherfordium (Rf, 106)bohrium (Bh, 107)hahnium (Hn, 108)meitnerium (Mt, 109) The ACU favoured a different set of names: mendelevium (Md, 101)nobelium (No, 102)lawrencium (Lr, 103)rutherfordium (Rf, 104)hahnium (Ha, 105)seaborgium (Sg, 106)nielsbohrium (Ns, 107)hassium (Hs, 108)meitnerium (Mt, 109) A compromise list was adopted by IUPAC in 1997 and is generally accepted: mendelevium (Md, 101)nobelium (No, 102)lawrencium (Lr, 103)rutherfordium (Rf, 104)dubnium (Db, 105)seaborgium (Sg, 106)bohrium (Bh, 107)hassium (Hs, 108)meitnerium (Mt, 109) Element 110 was named as darmstadtium in 2003 and element 111 was named roentgenium in 2004. So far elements 112 (ununbium, Uub), 113 (ununtrium, Uut), 114 (ununquadium, Uuq), 115 (ununpentium, Uup), and 116 (ununhexium, Uuh) are not officially named. All these elements are unstable and have very short half-lives.

mendelevium (Md, 101)

nobelium (No, 102)

lawrencium (Lr, 103)

dubnium (Db, 104)

joliotium (Jl, 105)

rutherfordium (Rf, 106)

bohrium (Bh, 107)

hahnium (Hn, 108)

meitnerium (Mt, 109)

mendelevium (Md, 101)

nobelium (No, 102)

lawrencium (Lr, 103)

rutherfordium (Rf, 104)

hahnium (Ha, 105)

seaborgium (Sg, 106)

nielsbohrium (Ns, 107)

hassium (Hs, 108)

meitnerium (Mt, 109)

mendelevium (Md, 101)

nobelium (No, 102)

lawrencium (Lr, 103)

rutherfordium (Rf, 104)

dubnium (Db, 105)

seaborgium (Sg, 106)

bohrium (Bh, 107)

hassium (Hs, 108)

meitnerium (Mt, 109)

Affix

Number

Symbol

nil

0

n

un

1

u

bi

2

b

tri

3

t

quad

4

q

pent

5

p

hex

6

h

sept

7

s

oct

8

o

enn

9

e

Subjects: Chemistry — Physics.


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