110
 
Ds  
269.000000
Darmstadtium

Name: Darmstadtium (Ununnilium)
Symbol: Ds (Uun)
Atomic Number: 110
AtomicWeight: 269.000000
Family: Transition Metals
CAS RN: 54083-77-1
Description: A synthetic element not present in nature, appearance unknown, probably metallic solid.
State (25 ° C): Unknown (Synthetic)
Oxidation states: unknown
Valence Electrons: 5f146d97s1

Boiling Point:  unknown
Melting Point:
unknown
Electrons Energy Level: unknown
Isotopes: 15 + None Stable
Heat of Vaporization: unknown
Heat of Fusion: unknown
Density: unknown
Specific Heat: unknown
Atomic Radius: unknown
Ionic Radius: unknown
Electronegativity: unknown
Vapor Pressure: unknown

History

Darmstadtium was first generated on November 9, 1994 at the Gesellschaft fur Schwerioneforschung (GSI) in Darmstadt, Germany, by a team headed by Dr. Jorge Rigol.   Only a few atoms of it were prepared by nuclear fusion, involving bombarding a lead target with nickel with a device known as a linear accelerator:

darmstadtium.jpg (5636 bytes)

This produced one atom of darmstadtium-269, an isotope with a half-life of about 0.17 milliseconds (0.00017 seconds), after at least a billion billion (1,000,000,000,000,000,000) nickel ions were fired at the lead target over the course of a week.

The element was named after the place of its discovery, Darmstadt (the GSI is located in Wixhausen, a northern portion of the city).  The new name was given to it by the IUPAC on August 16, 2003.

1s2
2s2 2p6
3s2 3p6 3d10
4s2 4p6 4d10 4f14
5s2 5p6 5d10 5f14
6s2 6p6 6d9
7s1

Ununnilium was the previous temporary IUPAC systematic name of this synthetic superheavy element in the periodic table with the symbol Uun and atomic number 110.

Isotopes

It is one of the so-called super-heavy atoms.  This syntheic element quickly decays: its isotopes of mass 267 to 273 have half-lives measured in microseconds.   Heavier isotopes of darmstadtium, of mass 279 and 281, have been subsequently synthesized and are more stable, with half-lives of 180 milliseconds and 11.1 seconds, respectively.

Darmstadtium's most stable isotope, darmstadtium-281, has a half-life of about 1.1 minutes.  It decays into hassium-277 through alpha decay.

atom.gif (700 bytes)

Isotope  
Atomic Mass
 
Half-Life
267Ds 267.14434 3 µs
268Ds 268.14380 ~100 µs
269Ds 269.14512 230 µs
270Ds 270.14472 160 µs
271Ds 271.14606 210 ms
272Ds 272.14632 ~1 seconds
273Ds 273.14886 0.17 ms
274Ds 274.14949 ~2 seconds
275Ds 275.15218 ~2 seconds
276Ds 276.15303 ~5 seconds
277Ds 277.15565 ~5 seconds
278Ds 278.15647 ~10 seconds
279Ds 279.15886 0.18 seconds
280Ds 280.15980 11 seconds
281Ds 281.16206 1.1 minutes

Nuclides produced include:

62Ni + 208Pb rarrow.gif (63 bytes) 269Ds + 1 n, 1994, GSI Darmstadt, 3 atoms

64Ni + 207Pb rarrow.gif (63 bytes) 270Ds + 1 n, 2000, GSI Darmstadt, 8 atoms

64Ni + 208Pb rarrow.gif (63 bytes) 271Ds + 1 n, 1994, GSI Darmstadt, 9 atoms

64Ni + 208Pb rarrow.gif (63 bytes) 271Ds + 1 n, 2000, GSI Darmstadt, 4 atoms

64Ni + 208Pb rarrow.gif (63 bytes) 271Ds + 1 n, 2000, LBNL Berkeley, 2 atoms

64Ni + 208Pb rarrow.gif (63 bytes) 271Ds + 1 n, 2002, RIKEN Japan, 14 atoms

70Zn + 208Pb rarrow.gif (63 bytes) 277Uub + 1 n, rarrow.gif (63 bytes) 273Ds + 1 alpha, 1996, GSI Darmstadt, 1 atom

70Zn + 208Pb rarrow.gif (63 bytes) 277Uub + 1 n, rarrow.gif (63 bytes) 273Ds + 1 alpha, 2000, GSI Darmstadt, 1 atom

48Ca + 244Pu rarrow.gif (63 bytes) 288Uuq + 4 n, rarrow.gif (63 bytes) 280Ds + 2 alpha, 1999, FLNR Dubna, 2 atoms

48Ca + 244Pu rarrow.gif (63 bytes) 289Uuq + 3 n, rarrow.gif (63 bytes) 281Ds + 2 alpha, 1998, FLNR Dubna, 1 atom

48Ca + 248Cm rarrow.gif (63 bytes) 292Uuh + 4 n, rarrow.gif (63 bytes) 280Ds + 3 alpha, 2000, FLNR Dubna, 1 atom

48Ca + 248Cm rarrow.gif (63 bytes) 292Uuh + 4 n, rarrow.gif (63 bytes) 280Ds + 3 alpha, 2001, FLNR Dubna, 2 atoms

Trivia

Some suggested (for fun) the name policium for the new element, because 110 is the emergency telephone number for the German police.

atom.gif (700 bytes)

Darmstadtium Data
 

Atomic Structure

  • Number of Electrons (with no charge): 110
  • Number of Neutrons (most common/stable nuclide): 161
  • Number of Protons: 110

Chemical Properties

  • No Chemical properties information is currently available.

Physical Properties

  • Atomic Mass Average: 271
  • Description:
    Synthetic produced radioactive super heavy element with an extremely short half life that does not occur in nature. Half-lives range from 180 microseconds for 269Ds to 1.1 minute for 281Ds.

Regulatory / Health

  • Levels In Humans:
    Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.
    • Blood/mg dm-3:
    • Bone/p.p.m:
    • Liver/p.p.m:
    • Muscle/p.p.m:
    • Daily Dietary Intake:
    • Total Mass In Avg. 70kg human:

Who / Where / When / How

  • Discoverer: S.Hofmann, V.Ninov, F.P.Heßberger, P.Armbruster, H.Folger, G.Münzenberg, H.J.Schött
  • Discovery Location: Darmstadt Germany
  • Discovery Year: 1994
  • Name Origin:
    Named after the location of discovery
  • Abundance:
    • Earth's Crust/p.p.m.:
    • Seawater/p.p.m.:
    • Atmosphere/p.p.m.:
    • Sun (Relative to H=1E12): N/A
  • Sources:
    Syntheticly produced element normally produced by fusing two lighter elements in a heavy ion accelerator.
  • Uses:
    Of research interest only
  • Additional Notes:
    Although we have found documented claims for the discovery of this element in 1987, it was not until November of 1994 when the first atom of Ds-269 was produced with the related scientific paper being published in 1995. In August of 2003 the International Union of Pure and Applied Chemistry (IUPAC) announced the official naming of this element.

Transition Metals
Group 3
(IIIB)
4
(IVB)
5
(VB)
6
(VIB)
7
(VIIB)
8
(VIIIB)
9
(VIIIB)
10 (VIIIB) 11
(IB)
12
(IIB)
Period 4 21
Sc
44.95
22
Ti
47.86
23
V
50.94
24
Cr
51.99
25
Mn
54.93
26
Fe
55.84
27
Co
58.93
28
Ni
58.69
29
Cu
63.54
30
Zn
65.39
Period 5 39
Y
88.90
40
Zr
91.22
41
Nb
92.90
42
Mo
95.94
43
Tc
98.00
44
Ru
101.0
45
Rh
102.9
46
Pd
106.4
47
Ag
107.8
48
Cd
112.4
Period 6 57
La
138.9
72
Hf
178.4
73
Ta
180.9
74
W
183.8
75
Re
186.2
76
Os
190.2
77
Ir
192.2
78
Pt
195.0
79
Au
196.9
80
Hg
200.5
Period 7 89
Ac
227.0
104
Rf
261.0
105
Db
262.0
106
Sg
266.0
107
Bh
264.0
108
Hs
269.0
109
Mt
268.0
110
Ds
269.0
111
Rg
272.0
112
Uub
277.0