Actinium
89
Ac
Groep
n.v.t.
Periode
7
Blok
f
Protonen
Elektronen
Neutronen
89
89
138
Algemene Eigenschappen
Atoomnummer
89
Atomair gewicht
[227]
Massa Getal
227
Categorie
Actiniden
Kleur
Zilver
Radioactief
Ja
From the Greek aktis, aktinos, meaning beam or ray
Kristalstructuur
Zijvlak-gecentreerde Kubus
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.
Eletronen per schil
2, 8, 18, 32, 18, 9, 2
Electronconfiguratie
[Rn] 6d1 7s2
Actinium glows in the dark with a pale blue light
Fysieke Eigenschappen
Fase
Vast
Dichtheid
10,07 g/cm3
Smeltpunt
1323,15 K | 1050 °C | 1922 °F
Kookpunt
3471,15 K | 3198 °C | 5788,4 °F
Fusiewarmte
14 kJ/mol
Verdampingswarmte
400 kJ/mol
Specifieke Warmtecapaciteit
0,12 J/g·K
Overvloedig aanwezig in de aardkorst
n.v.t.
Overvloedig aanwezig in het universum
n.v.t.
CAS-nummer
7440-34-8
PubChem CID nummer
n.v.t.
Atoomeigenschappen
Atoomstraal
-
Covalentiestraal
215 pm
Electronegativiteit
1,1 (Pauling schaal)
Ionisatiepotentiaal
5,17 eV
Atoomvolume
22,54 cm3/mol
Thermische geleiding
0,12 W/cm·K
Oxidatietoestanden
3
Toepassingen
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
Isotopen
Stabiele isotopen
-Instabiele isotopen
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