Dubnium

105
Db
Grupp
5
Period
7
Block
d
Protoner
Elektroner
Neutroner
105
105
157
Generella Egenskaper
Atomnummer
105
Atommassa
[268]
Masstal
262
Kategori
Övergångsmetaller
Färg
n/a
Radioaktiv
Ja
Named after the Russian town of Dubna
Kristallstruktur
n/a
Historia
Dubnium was reportedly first discovered in 1968 at the Joint Institute for Nuclear Research at Dubna.

Researchers there bombarded an americium-243 target with neon-22 ions.

In the same year, a team led by Albert Ghiorso working at the University of California, Berkeley conclusively synthesized the element by bombarding a californium-249 target with nitrogen-15 ions.
Elektroner per skal
2, 8, 18, 32, 32, 11, 2
Elektronkonfiguration
[Rn] 5f14 6d3 7s2
Db
The Berkeley team proposed the name hahnium for the element
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
39 g/cm3
Smältpunkt
-
Kokpunkt
-
Smältvärme
n/a
Ångbildningsvärme
n/a
Specifik värmekapacitet
-
Abundance in Earth's crust
n/a
Abundance in Universe
n/a
The
Bildkrediter: Wikimedia Commons (Hrustov)
The element is named after after the Russian town of Dubna, the location of the Joint Institute for Nuclear Research
CAS Number
53850-35-4
PubChem CID Number
n/a
Atomära Egenskaper
Atomradie
-
Kovalent radie
149 pm
Elektronegativitet
-
Jonisationspotential
-
Molvolym
-
Värmeledningsförmåga
0,58 W/cm·K
Oxidationstillstånd
5
Användningsområden
Dubnium is used for scientific research purposes only.
Dubnium is harmful due to its radioactivity
Isotoper
Stabila isotoper
-
Instabila isotoper
255Db, 256Db, 257Db, 258Db, 259Db, 260Db, 261Db, 262Db, 263Db, 264Db, 265Db, 266Db, 267Db, 268Db, 269Db, 270Db