Roentgenium 111

Atomic No. Order:

Alphabetic Order:

Periodic Table

2,8,18,32,

32,18,1

Cu
29

Ag
47

Au
79

Rg
111

Uhu
161

Buu
211

Roentgenium

Symbol

Radioactive
Artificially Produced

Atomic Number

111

Relative Atomic Mass
¹²C = 12.0000

[ 280 ]

Significant Atomic Mass

283
Neutrons 172

Atomic Radius pm

First Ionisation Energy
kJ mol ^-1

Electronegativity

Density kg m ^-3

Molar Volume cm ³

Thermal Conductivity
W m ^-1 K ^-1

Melting Point K

Boiling Point K

Phase at Room Temperature

Expected to be a Solid

Number of Isotopes

272   Rg   1.5 ms
273   Rg
274   Rg   6.4 ms
279   Rg   0.17 s
280   Rg   3.6 s

Inner + outer Shells

= 7

Inner + outer Orbitals

= 111

Filling Orbital

7s ¹

Ground State Electron Configuration

[Rn]

5f ¹⁴

6d ¹⁰

7s ¹

Ground State Electron Configuration with
free Orbitals (n= 7)

0,0,0,0,0,0, 7

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	10	14	18	22
7	1	1	6	10	14	18	22	26
8

Term Symbol

²S_1/2

CAS Reg-ID:

54386-24-2

Discovery

S. Hofmann, V. Ninov, F. P. Hessberger, P. Armbruster, H. Folger, G. Münzenberg, H. J. Schott, A. G. Popeko, A. V. Yeremin, A. N. Andreyev, S. Saro, R. Janik, M. Lein
8.12.1994

Element 111 is named roentgenium Following the 80th Meeting of the Bureau in Bled, Slovenia, the name roentgenium for the element of atomic number 111, with symbol Rg was officially approved as of 1 November 2004. The IUPAC Council, at its meeting at Ottawa, Canada in 2003, delegated the authority to approve a name for the element of atomic number 111 to the Bureau.

⁶⁴₂₈Ni + ²⁰⁹₈₃Bi → ²⁷²₁₁₁Rg + ¹₀n

Name Derived From

Roentgenium is pronounced as RENT-ghen-i-em

Röntgen also spelled ROENTGEN (b. March 27, 1845, Lennep, Prussia [now Remscheid, Ger.]--d. Feb. 10, 1923, Munich, Ger.), German physicist who was a recipient of the first Nobel Prize for Physics, in 1901, for his discovery of X rays, which heralded the age of modern physics and revolutionized diagnostic medicine.
Röntgen studied at the Polytechnic in Zürich and then was professor of physics at the universities of Strasbourg (1876-79), Giessen (1879-88), Würzburg (1888-1900), and Munich (1900-20). His research also included work on elasticity, capillary action of fluids, specific heats of gases, conduction of heat in crystals, absorption of heat by gases, and piezoelectricity.

Obsolete Names

Unununium, Uuu
eka-aurum, eka-gold ,eka-Au

The Hofmann et al. collaboration reports* on three new chains originating from ²⁷²Rg in the ⁶⁴Ni + ²⁰⁹Bi reaction. This brings the number of events to six, three of which proceed through the known descendants ²⁶⁰Db and ²⁵⁶Lr with decay property agreement. The latter in toto provide a strong linkage for the third, fourth, and sixth chains despite some scatter in ²⁶⁴Bh alpha energies and an incomplete alpha determination from ²⁷²Rg in the fourth chain.

Priority of discovery of Roentgenium by the Hofmann et al. collaboration has now been confirmed owing to the additional convincing observations in S. Hofmann, F. P. Hessberger, D. Ackermann, G. Münzenberg, S. Antalic, P. Cagarda, B. Kindler, J. Kojouharova, M. Leino, B. Lommel, R. Mann, A. G. Popeko, S. Reshitko, S. Saro, J. Uusitalo, A. V. Yeremin. "New results on elements 111 and 112", Eur. Phys. J. A 14, 147157 (2002).

Roentgenium's most stable isotope, roentgenium-280, has a half-life of about 3.6 seconds. It decays into meitnerium-276 through alpha decay.

S. Hofmann, V. Ninov, F. P. Hessberger, P. Armbruster, H. Folger, G. Münzenberg, H. J. Schott, A. G. Popeko, A. V. Yeremin, A. N. Andreyev, S. Saro, R. Janik, M. Leino. "The new element 111", Z. Phys. A 350, 281282 (1995).

APSIDIUM	Created:		2002-09-01		111.pdf
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