Meitnerium 109

Atomic No. Order:

Alphabetic Order:

Periodic Table

2,8,18,32,

32,15,2

Co
27

Rh
45

Ir
77

Mt
109

Upe
159

Bne
209

Meitnerium

Symbol

Mt
transition metal

Atomic Number

109

Relative Atomic Mass
¹²C = 12.0000

[ 276 ]
276.1512

Significant Atomic Mass

279
Neutrons 170

Atomic Radius pm

First Ionisation Energy
kJ mol ^-1

840 (est.)

Electronegativity

Density kg m ^-3

Molar Volume cm ³

Thermal Conductivity
W m ^-1 K ^-1

Melting Point K

Boiling Point K

Number of Isotopes

266 Mt 1.7 ms
268 Mt 70 ms
270 Mt 5 ms
275 Mt 9.7 ms
276 Mt 0.72 s

Inner + outer Shells

= 7

Inner + outer Orbitals

= 109

Filling Orbital

6d ⁷

Ground State Electron Configuration (unconfirmed)

[Rn]

5f ¹⁴

6d ⁷

7p ²

Ground State Electron Configuration with
free Orbitals (n=9)

0,0,0,0,0, 3, 6

Ground State Electron Configuration with compressed Orbitals (n=162)

0,0,0,0,18,54,90

Singularity

280

162

	s	p	d		f	g	h	i	j
1	2
2	2	6
3	2	6	10
4	2	6	10		14
5	2	6	10		14	18
6	2	6	7	3	14	18	22
7	2	6	10		14	18	22	26
8

Term Symbol

⁴ F _9/2

CAS Reg-ID:

54038-01-6

In 29. 08.1982 West German physicists at the Institute for Heavy Ion Research (Gesellschaft für Schwerionenforschung [GSI]) in Darmstadt synthesized an isotope of element 109 with a mass number of 266. Using a high-energy linear accelerator, the GSI investigators, under the direction of Peter Armbruster, G. Muenzenberg et al., bombarded bismuth-209 targets with beams of iron-58 ions for roughly 10 days. The resultant fusion reaction between the bismuth and iron atoms yielded only a single nucleus of the new element; however, the sensitivity of the detection technique employed left little doubt as to the validity of the identification. Meitnerium has an estimated half-life between 2 and 20 milliseconds.

⁵⁸₂₆Fe + ²⁰⁹₈₃Bi → ²⁶⁶₁₀₉Mt + ¹₀n

Obsolete Names

Unnilennium, Une
eka-iridium

Name derived from

Named after Lise Meitner
[1878-1968] Austrian-Swedish physicist and mathematician.

Symbol

Ds transition metal

APSIDIUM

Created:

2002-09-01

109.pdf

Page update:

2007-05-21