Template:Infobox actinium

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[[Category:Template:Pagetype with short description]]

Actinium, 89Ac
Actinium sample (31481701837).png
Actinium
Pronunciation/ækˈtɪniəm/ (Template:Respell)
Appearancesilvery-white, glowing with an eerie blue light;[1] sometimes with a golden cast[2]
Mass number[227]
Actinium in the periodic table
Template:Periodic table (32 columns, micro) La

Ac

(Uqt)
radiumactiniumthorium
Atomic number (Z)89
Groupgroup n/a
Periodperiod 7
Block  f-block
Electron configuration[Rn] 6d1 7s2
Electrons per shell2, 8, 18, 32, 18, 9, 2
Physical properties
Phase at STPsolid
Melting point1500 K ​(1227 °C, ​2240 °F) (estimated)[2]
Boiling point3500±300 K ​(3200±300 °C, ​5800±500 °F) (extrapolated)[2]
Density (near r.t.)10 g/cm3
Heat of fusion14 kJ/mol
Heat of vaporization400 kJ/mol
Molar heat capacity27.2 J/(mol·K)
Atomic properties
Oxidation states+3 (a strongly basic oxide)
ElectronegativityPauling scale: 1.1
Ionization energies
  • 1st: 499 kJ/mol
  • 2nd: 1170 kJ/mol
  • 3rd: 1900 kJ/mol
  • (more)
Covalent radius215 pm
Color lines in a spectral range
Spectral lines of actinium
Other properties
Natural occurrencefrom decay
Crystal structureface-centered cubic (fcc)
Face-centered cubic crystal structure for actinium
Thermal conductivity12 W/(m·K)
CAS Number7440-34-8
History
Discovery and first isolationFriedrich Oskar Giesel (1902)
Named byAndré-Louis Debierne (1899)
Main isotopes of actinium
[[Isotope|IsoTemplate:Shytope]] [[Natural abundance|AbunTemplate:Shydance]] Half-life (t1/2) Decay mode [[Decay product|ProTemplate:Shyduct]]
225Ac trace 10 d α 221Fr
226Ac syn 29.37 h β 226Th
ε 226Ra
α 222Fr
227Ac trace 21.772 y β 227Th
α 223Fr
Category Category: Actinium
| references

[[Category:Infobox templates|Template:Remove first word]]

data m.p. cat
in calc from C diff report ref
C 1227
K 1500 1500 0
F 2240 2241 -1 delta Template:Subpage other
max precision 0
WD Template:Wikidata Script error: No such module "EditAtWikidata". Template:Wikidata
input C: 1227, K: 1500, F: 2240
comment (estimated)[2]
data b.p. cat
in calc from C diff report ref
C 3200
K 3500 3470 30 delta
F 5800 5790 10 delta Template:Subpage other
max precision -2
WD Template:Wikidata Script error: No such module "EditAtWikidata". Template:Wikidata
input C: 3200±300, K: 3500±300, F: 5800±500
comment (extrapolated)[2]
Ra ←

i'box Ra

iso
89
Ac (E)
→ Th

i'box Th

  Data sets read by {{Infobox element}}
Name and identifiers
Top image (caption, alt)
Pronunciation
Category (enwiki)
Standard atomic weight
  most stable isotope
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Term symbol * (cmt, ref)
Wikidata *
* Not used in {{Infobox element}} (2019-02-03)
See also {{Infobox element/symbol-to--navbox}}

References

  1. Wall, Greg (8 September 2003). "C&EN: It's Elemental: The Periodic Table - Actinium". C&EN: It's Elemental: The Periodic Table. Chemical and Engineering News. Retrieved 2 June 2011.
  2. 2.0 2.1 2.2 Kirby, Harold W.; Morss, Lester R. (2006). "Actinium". The Chemistry of the Actinide and Transactinide Elements. p. 18. doi:10.1007/1-4020-3598-5_2. ISBN 978-1-4020-3555-5.

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