Chemicool
Ac
89
(227)
Actinium
General
|
States
|
Energies
|
Oxidation & Electrons
|
Appearance & Characteristics
Reactions
|
Other Forms
|
Radius
|
Conductivity
|
Abundance
Encyclopedia Britannica articles
General
Name
Actinium
Symbol
Ac
atomic number
89
Atomic weight
(227)
Density @ 293 K
10.07 g/cm3
Atomic volume
22.54 cm3/mol
Group
Trans. Met.
discovered
1899
States
state (s, l, g)
s
melting point
1323.2 K
boiling point
2743 K
Heat of fusion
?
Heat of vaporization
?
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Energies
1st ionization energy
499 kJ/mole
electronegativity
1.1
2nd ionization energy
1170 kJ/mole
electron affinity
kJ/mole
3rd ionization energy
kJ/mole
Specific heat
?
heat atomization
385 kJ/mole atoms
Oxidation & Electrons
Shells
2,8,18,32,18,9,2
electron configuration
[Rn] 6d1 7s2
minimum oxidation number
0
maximum oxidation number
3
min. common oxidation no.
0
max. common oxidation no.
3
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Appearance & Characteristics
structure
fcc: face-centered cubic
color
silvery-white
uses
thermoelectric power
toxicity
hardness
mohs
characteristics
Radioactive
Reactions
reaction with air
mild, w/ht, = Ac2O3
reaction with 6M HCl
mild, = H2, AcCl3
reaction with 6M HCl
mild, = H2, AcCl3
reaction with 15M HNO3
mild, = Ac(NO3)3
reaction with 6M NaOH
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Other Forms
number of isotopes
2
hydride(s)
AcH2
oxide(s)
Ac2O3
chloride(s)
AcCl3
Radius
ionic radius (2- ion)
pm
ionic radius (1- ion)
pm
atomic radius
pm
ionic radius (1+ ion)
pm
ionic radius (2+ ion)
pm
ionic radius (3+ ion)
126 pm
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Conductivity
thermal conductivity
J/m-sec-deg
electrical conductivity
1/mohm-cm
polarizability
32.1 A^3
Abundance
source
Synthetic(U-235 decay)
rel. abund. solar system
log
abundance earth's crust
-9.3 log
cost, pure
$/100g
cost, bulk
$/100g
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