Aktinij

89
Ac
Skupina
n/a
Perioda
7
Blok
f
Protons
Electrons
Neutrons
89
89
138
General Properties
Vrstno število
89
Atomska teža
[227]
Mass Number
227
Kategorija
Aktinoidi
Barva
Silver
Radioactive
Da
From the Greek aktis, aktinos, meaning beam or ray
Kristalna struktura
Ploskovno centrirana kubična
Zgodovina
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.
Electrons per shell
2, 8, 18, 32, 18, 9, 2
Razporeditev elektronov
[Rn] 6d1 7s2
Ac
Actinium glows in the dark with a pale blue light
Physical Properties
Faza snovi
Trdnina
Gostota
10,07 g/cm3
Tališče
1323,15 K | 1050 °C | 1922 °F
Vrelišče
3471,15 K | 3198 °C | 5788,4 °F
Talilna toplota
14 kJ/mol
Izparilna toplota
400 kJ/mol
Toplotna kapaciteta
0,12 J/g·K
Abundance in Earth's crust
n/a
Abundance in Universe
n/a
Illustration
Zasluge za slike: Images-of-elements
Illustration of actinium
CAS Number
7440-34-8
PubChem CID Number
n/a
Atomic Properties
Atomski polmer
-
Kovalentni polmer
215 pm
Elektronegativnost
1,1 (Paulingova lestvica)
Ionization Potential
5,17 eV
Atomic Volume
22,54 cm3/mol
Toplotna prevodnost
0,12 W/cm·K
Oksidacijska stanja
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
Isotopes
Stable Isotopes
-
Unstable Isotopes
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