Chemicool
Ra
88
226.0254
Radium
General
|
States
|
Energies
|
Oxidation & Electrons
|
Appearance & Characteristics
Reactions
|
Other Forms
|
Radius
|
Conductivity
|
Abundance
Encyclopedia Britannica articles
General
Name
Radium
Symbol
Ra
atomic number
88
Atomic weight
226.0254
Density @ 293 K
5 g/cm3
Atomic volume
45.20 cm3/mol
Group
Alkali Earth
discovered
1898
States
state (s, l, g)
s
melting point
973.2 K
boiling point
1973 K
Heat of fusion
?
Heat of vaporization
?
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Energies
1st ionization energy
509.4 kJ/mole
electronegativity
0.9
2nd ionization energy
979.1 kJ/mole
electron affinity
kJ/mole
3rd ionization energy
kJ/mole
Specific heat
0.12 J/gK
heat atomization
159 kJ/mole atoms
Oxidation & Electrons
Shells
2,8,18,32,18,8,2
electron configuration
[Rn] 7s2
minimum oxidation number
0
maximum oxidation number
2
min. common oxidation no.
0
max. common oxidation no.
2
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Appearance & Characteristics
structure
bcc: body-centered cubic
color
white
uses
neutron source
toxicity
hardness
mohs
characteristics
Radioactive, luminescent
Reactions
reaction with air
vigorous, = RaO2, Ra3N2
reaction with 6M HCl
reaction with 6M HCl
reaction with 15M HNO3
reaction with 6M NaOH
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Other Forms
number of isotopes
4
hydride(s)
oxide(s)
chloride(s)
RaCl2
Radius
ionic radius (2- ion)
pm
ionic radius (1- ion)
pm
atomic radius
pm
ionic radius (1+ ion)
pm
ionic radius (2+ ion)
162 pm
ionic radius (3+ ion)
pm
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Conductivity
thermal conductivity
18.6 J/m-sec-deg
electrical conductivity
1/mohm-cm
polarizability
38.3 A^3
Abundance
source
pitchblende(U-238 decay)
rel. abund. solar system
log
abundance earth's crust
-6 log
cost, pure
$/100g
cost, bulk
$/100g
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