Bohrium

in Wikipedia, die vrye ensiklopedie

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107

seaborgium - bohrium - hassium

Re
|
Bh
|
(Uhu)

Algemeen

bohrium, Bh, 107

7, 7, d

(270) g/mol

voorspel;^[1] [Rn] 5f¹⁴ 6d⁵ 7s²

Elektrone per skil

voorspel; 2, 8, 18, 32, 32, 13, 2

CAS-registernommer

54037-14-8

Fisiese eienskappe

Toestand

voorspel;^[2] vastestof

Digtheid (naby k.t.)

voorspel; 37,1 g/cm3

Atoomeienskappe

Oksidasietoestande

7, (5), (4), (3)^[3]^[4]

Ionisasie-energiee

1ste: 742,9 kJ/mol

2de: 1 688,5 kJ/mol

3de: 2 566,5 kJ/mol

Geskiedenis

Ontdek

1981

Ontdek deur

Sentrum vir Swaarioonnavorsing,
Darmstadt, Duitsland

Genoem na

Niels Bohr

Datum van naam

1997

Vorige naam

unnilseptium (Uns)

Vernaamste isotope

Hoofartikel: Isotope van bohrium
iso	NV	halfleeftyd	VM	VE (MeV)	VP
²⁷⁴Bh	sin	40 s	a	8,8	²⁷⁰Db
²⁷²Bh	sin	10 s	a	9,02	²⁶⁸Db
²⁷¹Bh	sin	1 s	a	9,35	²⁶⁷Db

Portaal Chemie

Bohrium is 'n superswaar, kunsmatige element met die atoomgetal 107 en simbool Bh. Dit kom nie in die natuur voor nie, kan net in 'n laboratorium vervaardig word en is radioaktief. Die stabielste bekende isotoop, bohrium-270, het 'n halfleeftyd van ongeveer 61 sekondes.

Die element is genoem na die Deense fisikus Niels Bohr.

Op die periodieke tabel le dit in die d-blok, in groep 7 en periode 7. Dit is dus die vyfde lid van die 6d-reeks oorgangsmetale. Chemiese eksperimente het bevestig dit tree op soos die swaarder homoloog van renium net bo dit. Sy eienskappe is net gedeeltelik vasgestel, maar dit stem baie ooreen met die van ander elemente in groep 7.

Verwysings

[wysig | wysig bron]

| Johnson, E.; Fricke, B.; Jacob, T.; Dong, C. Z.; Fritzsche, S.; Pershina, V. (2002). "Ionization potentials and radii of neutral and ionized species of elements 107 (bohrium) and 108 (hassium) from extended multiconfiguration Dirac-Fock calculations". The Journal of Chemical Physics. 116: 1862. Bibcode:2002JChPh.116.1862J. doi:10.1063/1.1430256.
| Ostlin, A.; Vitos, L. (2011). "First-principles calculation of the structural stability of 6d transition metals". Physical Review B. 84 (11). Bibcode:2011PhRvB..84k3104O. doi:10.1103/PhysRevB.84.113104.
| Hoffman, Darleane C.; Lee, Diana M.; Pershina, Valeria (2006). "Transactinides and the future elements". In Morss; Edelstein, Norman M.; Fuger, Jean (reds.). The Chemistry of the Actinide and Transactinide Elements (3de uitg.). Dordrecht, Nederland: Springer Science+Business Media. ISBN 1-4020-3555-1.
| Fricke, Burkhard (1975). "Superheavy elements: a prediction of their chemical and physical properties". Recent Impact of Physics on Inorganic Chemistry. 21: 89-144. doi:10.1007/BFb0116498. Besoek op 4 Oktober 2013.