Aktinium

89
Ac
Grupp
n/a
Period
7
Block
f
Protoner
Electrons
Neutroner
89
89
138
Generella Egenskaper
Atomnummer
89
Atommassa
[227]
Mass Number
227
Kategori
Aktinider
Färg
Silver
Radioaktiv
Ja
From the Greek aktis, aktinos, meaning beam or ray
Kristallstruktur
Ytcentrerat kubiskt
Historia
André-Louis Debierne, a French chemist, discovered actinium in 1899.

He separated it from pitchblende residues left by Marie and Pierre Curie after they had extracted radium.

Friedrich Oskar Giesel independently discovered actinium in 1902 as a substance being similar to lanthanum.
Elektroner per skal
2, 8, 18, 32, 18, 9, 2
Elektronkonfiguration
[Rn] 6d1 7s2
Ac
Actinium glows in the dark with a pale blue light
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
10,07 g/cm3
Smältpunkt
1323,15 K | 1050 °C | 1922 °F
Kokpunkt
3471,15 K | 3198 °C | 5788,4 °F
Smältvärme
14 kJ/mol
Ångbildningsvärme
400 kJ/mol
Specifik värmekapacitet
0,12 J/g·K
Abundance in Earth's crust
n/a
Abundance in Universe
n/a
Illustration
Bildkrediter: Images-of-elements
Illustration of actinium
CAS Number
7440-34-8
PubChem CID Number
n/a
Atomära Egenskaper
Atomradie
-
Kovalent radie
215 pm
Elektronegativitet
1,1 (Paulingskalan)
Jonisationspotential
5,17 eV
Molvolym
22,54 cm3/mol
Värmeledningsförmåga
0,12 W/cm·K
Oxidationstillstånd
3
Applications
Actinium is used as an active element of radioisotope thermoelectric generators, for example in spacecraft.

The medium half-life of 227Ac makes it very convenient radioactive isotope in modeling the slow vertical mixing of oceanic waters.

225Ac is applied in medicine to produce 213Bi in a reusable generator or can be used alone as an agent for radiation therapy.
Actinium is highly radioactive
Isotoper
Stabila isotoper
-
Instabila isotoper
206Ac, 207Ac, 208Ac, 209Ac, 210Ac, 211Ac, 212Ac, 213Ac, 214Ac, 215Ac, 216Ac, 217Ac, 218Ac, 219Ac, 220Ac, 221Ac, 222Ac, 223Ac, 224Ac, 225Ac, 226Ac, 227Ac, 228Ac, 229Ac, 230Ac, 231Ac, 232Ac, 233Ac, 234Ac, 235Ac, 236Ac