109
  Mt  
268.000000
Meitnerium

Name: Meitnerium
Symbol: Mt
Atomic Number: 109
AtomicWeight: 268.000000
Family: Transition Metals
CAS RN: 54038-01-6
Description: A synthetic element not present in nature, appearance unknown, probably metallic solid.
State (25°C): Unknown (Synthetic)
Oxidation states: unknown

Molar Volume: unknown
Valence Electrons: 6d77s2

Boiling Point:  unknown
Melting Point:
unknown
Electrons Energy Level: 2, 8, 18, 32, 32, 15, 2
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
1s2 2s2p6 3s2p6d10 4s2p6d10f14 5s2p6d10f14 6s2p6d7 7s2

History

Meitnerium was first synthesized on August 29, 1982 by a German research team led by Peter Armbruster and Gottfried Munzenberg at the Institute for Heavy Ion Research (Gesellschaft für Schwerionenforschung) in Darmstadt.
The team bombarded a target of 209Bi with accelerated nuclei of 58Fe.   The synthesis of this element demonstrated that nuclear fusion techniques could be used to make new, heavy nuclei.

meitner.gif (35721 bytes)

Lise Meitner

The name meitnerium was suggested in honor of the Austrian physicist and mathematician Lise Meitner, who helped discover protactinium and first split the nucleus of uranium, creating what her team dubbed "fission".  There was an element naming controversy as to what the elements from 101 to 109 were to be called; thus IUPAC dopted unnilennium, symbol Une) as a temporary, systematic element name.  In 1997, however, the dispute was resolved and the current name was adopted.

Isotopes

It is a synthetic element whose most stable isotope is 276Mt with a half-life of  0.72 seconds.

atom.gif (700 bytes)

Isotope  
Atomic Mass
 
Half-Life
265Mt 265.13615 ~2 ms
266Mt 266.13730 1.2 ms
267Mt 267.13731 ~10 ms
268Mt 268.13873 21 ms
269Mt 269.13906 ~200 ms
270Mt 270.14066 ~2 seconds
271Mt 271.14114 ~5 seconds
272Mt 272.14374 ~10 seconds
273Mt 273.14491 ~20 seconds
274Mt 274.14749 ~20 seconds
275Mt 275.14865 9.7 ms
276Mt 276.15116 0.72 seconds
277Mt 277.15242 ~1 minutes
278Mt 278.15481 ~30 minutes
279Mt 279.15619 ~6 minutes

atom.gif (700 bytes)

Meitnerium Data
 

Atomic Structure

  • Atomic Radius:
  • Atomic Volume:
  • Covalent Radius:
  • Cross Section (Thermal Neutron Capture) Barns: 
  • Crystal Structure:
  • Electron Configuration:
    1s2 2s2p6 3s2p6d10 4s2p6d10f14 5s2p6d10f14 6s2p6d7 7s2
  • Electrons per Energy Level: 2, 8, 18, 32, 32, 15, 2
  • Ionic Radius:
  • Filling Orbital:
  • Number of Electrons (with no charge): 109
  • Number of Neutrons (most common/stable nuclide): 157
  • Number of Protons: 109
  • Oxidation States:
  • Valence Electrons:

Chemical Properties

  • Electrochemical Equivalent:
  • Electron Work Function:
  • Electronegativity: N/A (Pauling); N/A (Allrod Rochow)
  • Heat of Fusion: kJ/mol
  • Incompatibilities:
  • Ionization Potential
    • First:
  • Valence Electron Potential (-eV):

Physical Properties

  • Atomic Mass Average: 266
  • Boiling Point:
  • Coefficient of Lineal Thermal Expansion/K-1: N/A
  • Conductivity
    Electrical:
    Thermal:
  • Description:
    Man made radioactive metal. Does not occur in nature.
  • Flammablity Class:
  • Freezing Point: see melting point
  • Heat of Vaporization: kJ/mol
  • Melting Point:
  • Physical State (at 20°C & 1atm):
  • Specific Heat:
  • Vapor Pressure:

Regulatory / Health

  • CAS Number
    • 54038-01-6
  • NFPA 704
    • Health:
    • Fire:
    • Reactivity:
    • Special Hazard: Radioactive<
    • OSHA Permissible Exposure Limit (PEL)
      • No limits set by OSHA
    • OSHA PEL Vacated 1989
      • No limits set by OSHA
    • NIOSH Recommended Exposure Limit (REL)
      • No limits set by NIOSH
    • 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: nil
      • Bone/p.p.m: nil
      • Liver/p.p.m: nil
      • Muscle/p.p.m: nil
      • Daily Dietary Intake: nil
      • Total Mass In Avg. 70kg human: nil

    Who / Where / When / How

    • Discoverer: Peter Armbruster, Gottfried Münzenberg, et. Al.
    • Discovery Location: Darmstadt Germany
    • Discovery Year: 1982
    • Name Origin:
      Named for Lise Meitner, a Swedish physicist who helped discover protactinium and first split the nucleus of uranium, creating what her team dubbed "fission".
    • Abundance:
      • Earth's Crust/p.p.m.: nil
      • Seawater/p.p.m.: nil
      • Atmosphere/p.p.m.: nil
      • Sun (Relative to H=1E12): N/A
    • Sources:
      First synthetically produced by bombarding Bi209 with accelerated nuclei of Fe58. Only a few atoms have ever been produced.
    • Uses:
      None
    • Additional Notes:
      In August of 1997 the International Union of Pure and Applied Chemistry announced the official naming of this element as Meitnerium.

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