Periodic
Table
|
Radium
|
Symbol
|
Ra
|
|
Atomic
Number
|
88
|
Relative
Atomic
Mass
12C
=
12.0000
|
[
226
]
|
|
Significant
Atomic
Mass
|
225
Neutrons
137
|
|
Atomic
Radius
pm
|
223
|
First
Ionisation
Energy
kJ
mol
-1
|
509.3
|
|
Ionization energy (eV)
|
5,2784
|
|
Electronegativity
|
0.89
|
|
Density kg
m
-3
|
c.
5000
[293
K]
|
|
Molar
Volume
cm
3
|
45.2
|
Thermal
Conductivity
W
m
-1
K
-1
|
18.6
[300
K]
(est.)
|
|
Melting
Point
K
|
973
|
|
Boiling
Point
K
|
1413
|
|
Isotopes
|
223
|
223.0185
|
11.43(1)
day
|
|
|
224
|
224.0202
|
3.66(2) day
|
|
|
226
|
226.0254
|
1599(4) year
|
|
|
228
|
228.0311
|
5.75(3)
year
|
|
Number
of
Isotopes
|
25
|
|
Inner
+
outer
Shells
|
|
|
Inner
+
outer
Orbitals
|
|
|
Filling
Orbital
|
|
Ground
State
Electron
Configuration
|
|
|
|
Ground
State
Electron
Configuration
with
free
Orbital
(n=
30
)
|
|
|
|
Ground
State
Electron
Configuration
with
compr.
Orbitals (n=
162
)
|
|
|
|
|
Singularity
S(n)
|
|
|
|
|
|
s
|
p
|
d
|
f
|
g
|
h
|
i
|
j
|
|
1
|
2
|
|
|
|
|
|
|
|
|
2
|
2
|
6
|
|
|
|
|
|
|
|
3
|
2
|
6
|
10
|
|
|
|
|
|
|
4
|
2
|
6
|
10
|
14
|
|
|
|
|
|
5
|
2
|
6
|
10
|
14
|
18
|
|
|
|
|
6
|
2
|
6
|
10
|
14
|
18
|
22
|
|
|
|
7
|
2
|
6
|
10
|
14
|
18
|
22
|
26
|
|
|
8
|
|
|
|
|
|
|
|
|
|
|
|
|
Term
Symbol
|
1S0
|
|
Discovery
|
Discovered
by
P.
Curie
and
M.
Curie
(Paris,
France)
in
1898.
Isolated
by
M.
Curie
in
1911
|
|
Name
Derived
From
|
Latin
radius
meaning
'ray'
|
|
