Actiniu
89
Ac
Grupă
n/a
Perioadă
7
Bloc
f
Protoni
Electroni
Neutroni
89
89
138
Proprietăți Generale
Număr atomic
89
Masă atomică
[227]
Numar de masa
227
Categorie
Actinide
Culoare
Argint
Radioactive
Da
Din greacă aktis, aktinos, însemnând grindă sau rază
Structură cristalină
Față Centrată Cubic
Istoric
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.
Electroni pe nivelul de energie
2, 8, 18, 32, 18, 9, 2
Configurație electronică
[Rn] 6d1 7s2
Actinium glows in the dark with a pale blue light
Proprietăți Fizice
Fază
Solid
Densitate
10,07 g/cm3
Punct de topire
1323,15 K | 1050 °C | 1922 °F
Punct de fierbere
3471,15 K | 3198 °C | 5788,4 °F
Energie de fuziune
14 kJ/mol
Energie de evaporare
400 kJ/mol
Căldură specifică
0,12 J/g·K
Abundența în scoarța Pământului
n/a
Abundența în Univers
n/a
![Illustration](https://periodic-table.io/images/elements/Ac.jpg)
Numarul CAS
7440-34-8
Număr CID PubChem
n/a
Proprietăți Atomice
Rază atomică
-
Rază de covalență
215 pm
Electronegativitate
1,1 (Scara lui Pauling)
Potențial de ionizare
5,17 eV
Volum molar
22,54 cm3/mol
Conductivitate termică
0,12 W/cm·K
Număr de oxidare
3
Aplicații
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
Izotopi
Izotopi stabili
-Izotopi instabili
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