DARMSTADTIUM

Introduction

Atomic Number: 110
Group: 10 or VIII B
Atomic Weight: 281
Period: 7
CAS Number: 54083-77-1

Classification

Chalcogen
Halogen
Noble Gas
Lanthanoid
Actinoid
Rare Earth Metal
Platinum Group Metal
Transuranium
No Stable Isotopes
Solid
Liquid
Gas
Solid (Predicted)

Description

In 1987 Oganessian, et al., at Dubna, claimed discovery of this element. Their experiments indicated the spontaneous fissioning nuclide Element 110-272 with a half-life of 10 ms. More recently a group led by Armbruster at G.S.I. in Darmstadt, Germany, reported evidence of Element 110-269, which was produced by bombarding lead for many days with more than 10^18 nickel atoms. A detector searched each collision for Element 110ĺs distinct decay sequence. On November 9, 1994, evidence of 110 was detected. Berkeley scientists, in 1991, performed similar experiments and reported evidence of 110, but this was not confirmed. Workers at Dubna have experiments underway to produce Element 110-273 by bombarding plutonium with sulfur atoms. Other experiments at G.S.I. are now searching for heavier isotopes. Several years ago the IUPAC suggested the use of the temporary name ununnilium for Element 110 when it was found. 1

Physical Properties

Density:  g/cm3

* - at 1 atm

Electron Configuration

Electron Configuration: [Rn] 7s2 5f14 6d8
Block: d
Highest Occupied Energy Level: 7
Valence Electrons: 2

Quantum Numbers:

n = 6
ℓ = 2
m = 0
ms = -Ż

Bonding

Isotopes

Nuclide Mass 2 Half-Life 2 Nuclear Spin 2 Binding Energy
267Ds 267.14434(39)# 3(+6-2) Ás 9/2+# 1,903.16 MeV
268Ds 268.14380(54)# 100# Ás 0+ 1,911.24 MeV
269Ds 269.14512(15)# 230(110) Ás [179(+245-66) Ás] 3/2+# 1,919.32 MeV
270Ds 270.14472(31)# 160(100) Ás [0.10(+14-4) ms] 0+ 1,927.40 MeV
271Ds 271.14606(11)# 210(170) ms 11/2-# 1,935.47 MeV
272Ds 272.14632(70)# 1# s 0+ 1,943.55 MeV
273Ds 273.14886(14)# 0.17(+17-6) ms 13/2-# 1,951.63 MeV
274Ds 274.14949(53)# 2# s 0+ 1,959.71 MeV
275Ds 275.15218(48)# 2# s 1,958.47 MeV
276Ds 276.15303(65)# 5# s 0+ 1,966.55 MeV
277Ds 277.15565(104)# 5# s 11/2+# 1,974.63 MeV
278Ds 278.15647(73)# 10# s 0+ 1,982.71 MeV
279Ds 279.15886(80)# 0.18(+5-3) s 1,990.79 MeV
280Ds 280.15980(91)# 11(6) s 0+ 1,998.87 MeV
281Ds 281.16206(78)# 9.6 s 3/2+# 1,997.63 MeV
Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses. 2

Abundance

Safety Information


Material Safety Data Sheet - ACI Alloys, Inc.

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For More Information

External Links:

Sources

(1) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4:11.
(2) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:123-6:137.
(3) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:107-6:122.
(4) - Atomic Mass Data Center. http://amdc.in2p3.fr/web/nubase_en.html (accessed July 14, 2009).