Actinium
89
Ac
Gruppe
I/T
Periode
7
Blokk
f
Protoner
Elektroner
Nøytroner
89
89
138
Generelle egenskaper
Atomnummer
89
Atomvekt
[227]
Massetall
227
Kategori
Aktinoider
Farge
Sølv
Radioaktiv
Ja
From the Greek aktis, aktinos, meaning beam or ray
Krystallstruktur
Face Centered Cubic
Historie
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.
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 energinivå
2, 8, 18, 32, 18, 9, 2
Elektronkonfigurasjon
[Rn] 6d1 7s2
Actinium glows in the dark with a pale blue light
Fysikalske egenskaper
Fase
Fast stoff
Tetthet
10,07 g/cm3
Smeltepunkt
1323,15 K | 1050 °C | 1922 °F
Kokepunkt
3471,15 K | 3198 °C | 5788,4 °F
Smeltevarme
14 kJ/mol
Fordampningsvarme
400 kJ/mol
Spesifikk varmekapasitet
0,12 J/g·K
Forekomst i jordskorpa
I/T
Forekomst i universet
I/T
CAS Number
7440-34-8
PubChem CID Number
I/T
Atomegenskaper
Atomradius
-
Kovalent radius
215 pm
Elektronegativitet
1,1 (Pauling-skalaen)
Ioniseringsenergi
5,17 eV
Molart volum
22,54 cm3/mol
Termisk ledningsevne
0,12 W/cm·K
Oksidasjonstilstander
3
Bruksområder
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.
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
Stabile isotoper
-Ustabile 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