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The Mineralogy of Actinium

General Properties
Symbol:Ac
Atomic Number:89
Standard atomic weight (Ar):[227]
Electron configuration:[Rn] 6d1 7s2
Photos
Actinium 225 with a half-life of 10 days
Atomic Properties
Electronegativity (Pauling scale):1.1
Ionic Radius:112 pm (+3)
1st Ionization energy:499 kJ/mol
Oxidation States:3
Physical Properties
Standard State:solid
Bonding Type:metallic
Melting Point:1323 K
Boiling Point:3473 K
Density:10.07 g/cm3
Metal/Non-Metal:actinoid
Main isotopes of Actinium
Isotope% in NatureHalf LifeDecay typeDecay product
225Actrace10dα221Fr
226Acsynthetic29.37hβ−226Th
ε226Ra
α222Fr
227Actrace21.772yβ−227Th
α223Fr
Main ions of Actinium
NameIonExample minerals
actinium(III)Ac3+
Other Information
Year Discovered:1902
Discovered By:Friedrich Oskar Giesel
Year Isolated:1902
Isolated By:Friedrich Oskar Giesel
Named For:Greek: aktis; aktinos - "beam (ray)"
CPK color coding:#70ABFA
External Links:WikipediaWebElementsLos Alamos National LaboratoryTheodore Gray's PeriodicTable.com
Simple Compounds
Sulfidesdiactinium trisulphideAc2S3+3
Hydridesactinium dihydrideAcH2+2
Fluoridesactinium trifluorideAcF3+3
Chloridesactinium trichlorideAcCl3+3
Iodidesactinium triiodideAcI3+3
Oxidesdiactinium trioxideAc2O3+3
Phosphatesactinium phosphateAcPO4+3
Geochemistry of Actinium
Goldschmidt classification:Lithophile
Elemental Abundance for Actinium
Crust (CRC Handbook)5.5 x 10-16mass fraction, kg/kg
Periodic Table
1H 2He
3Li 4Be 5B 6C 7N 8O 9F 10Ne
11Na 12Mg 13Al 14Si 15P 16S 17Cl 18Ar
19K 20Ca 21Sc 22Ti 23V 24Cr 25Mn 26Fe 27Co 28Ni 29Cu 30Zn 31Ga 32Ge 33As 34Se 35Br 36Kr
37Rb 38Sr 39Y 40Zr 41Nb 42Mo 43Tc 44Ru 45Rh 46Pd 47Ag 48Cd 49In 50Sn 51Sb 52Te 53I 54Xe
55Cs 56Ba 57La 72Hf 73Ta 74W 75Re 76Os 77Ir 78Pt 79Au 80Hg 81Tl 82Pb 83Bi 84Po 85At 86Rn
87Fr 88Ra 89Ac 104Rd 105Db 106Sg 107Bh 108Hs 109Mt 110Ds 111Rg 112Cn 113Nh 114Fl 115Mc 116Lv 117Ts 118Og
 
58Ce 59Pr 60Nd 61Pm 62Sm 63Eu 64Gd 65Tb 66Dy 67Ho 68Er 69Tm 70Yb 71Lu
90Th 91Pa 92U 93Np 94Pu 95Am 96Cm 97Bk 98Cf 99Es 100Fm 101Md 102No 103Lr
Default Categories CPK Electronegativity Atomic Radius Lowest Oxidation Highest Oxidation Crustal Abundance Goldschmidt Mineral Species
Radium << Actinium >> Thorium


Spotted a mistake/omission? - These pages are a work in progress, so please send all comments/corrections to jolyon@mindat.org. Thank you.

Constants and physical property data from:

David R. Lide (ed.), CRC Handbook of Chemistry and Physics, 85th Edition. CRC Press. Boca Raton, Florida (2005).
Kaye and Laby Tables of Physical & Chemical Constants (2005). Section 3.1.3, Abundances of the elements
A. Earnshaw, N. Greenwood, Chemistry of the Elements, 2nd edition, Butterworth-Heinemann, (1997)
Thomas J. Ahrens (ed.), Global Earth Physics : A Handbook of Physical Constants, American Geophysical Union (1995)
L.B. Railsback, An Earth Scientist's Periodic Table of the Elements and Their Ions : Geology 31:9 p737-740 (2003)
Emsley, J. Nature's Building Blocks: An A-Z Guide to the Elements. New York: Oxford University Press (2001)
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