Actinium

Images

Image

Attribution: None

Animated Actinium

History

From the Greek aktis, aktinos, meaning beam or ray. Discovered by Andre Debierne in 1899 and independently by F. Giesel in 1902. Occurs naturally in association with uranium minerals.

General Info

AtomicNumber
89
Symbol
Ac
Name
Actinium

Atomic Info

Appearance
AtomicWeight
[227]
Color
70ABFA
ElectronicConfiguration
[Rn] 6d1 7s2
ElectronegativityInPauling
1.1
AtomicRadiusInPM
IonRadiusInPM
112 (+3)
VanDerWaalsRadiusInPM
IEinKJmol
499
EAinKJmol
OxidationStates
3
StandardState
solid
BondingType
metallic
MeltingPoint
1323
BoilingPoint
3473
Density
10.07
State
Actinide
DiscoveredYear
1899