Актиниум

89
Ac
Група
Нема одговор
Периода
7
блок
f
Protons
Electrons
Neutrons
89
89
138
Општи Својства
Атомски број
89
Атомска тежина
[227]
Mass Number
227
Category
Актиноид
Color
Silver
Radioactive
Да
From the Greek aktis, aktinos, meaning beam or ray
Кристална структура
Face Centered Cubic
History
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
Електронска конфигурација
[Rn] 6d1 7s2
Ac
Actinium glows in the dark with a pale blue light
Физички Својства
Фаза
Solid
Густина
10,07 g/cm3
Точка на топење
1323,15 K | 1050 °C | 1922 °F
Точка на вриење
3471,15 K | 3198 °C | 5788,4 °F
Топлина на топење
14 kJ/mol
Топлина на испарување
400 kJ/mol
Specific Heat Capacity
0,12 J/g·K
Abundance in Earth's crust
Нема одговор
Abundance in Universe
Нема одговор
Illustration
Кредити на слика: Images-of-elements
Illustration of actinium
CAS Number
7440-34-8
PubChem CID Number
Нема одговор
Атомски Својства
Атомски полупречник
-
Ковалентен полупречник
215 pm
Електронегативност
1,1 (Полингова скала)
Ionization Potential
5,17 eV
Atomic Volume
22,54 cm3/mol
Thermal Conductivity
0,12 W/cm·K
Oxidation States
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