Periodic
Table
|
Barium
|
Symbol
|
Ba
|
|
Atomic
Number
|
56
|
Relative
Atomic
Mass
12C
=
12.0000
|
137.327
(7)
[Since
1985]
|
|
Atomic
Radius
pm
|
217
|
First
Ionisation
Energy
kJ
mol
-1
|
502.8
|
|
Ionization
energy
(eV)
|
5,2117
|
|
Electronegativity
|
0.89
|
Density
kg
m
-3
|
3594
[293
K]
3325
[m.p.]
|
|
Molar
Volume
cm
3
|
38.21
|
Thermal
Conductivity
W
m
-1
K
-1
|
18.4
[300
K]
|
|
Melting
Point
K
|
1002
|
|
Boiling
Point
K
|
1910
|
|
Number
of
Isotopes
|
37
|
|
Isotope
Atomic
mass/u
Mole
fraction
|
130Ba
129.906
311(7)
0.001
06(1)
132Ba
131.905
056(3)
0.001
01(1)
134Ba
133.904
504(3)
0.024
17(18)
135Ba
134.905
684(3)
0.065
92(12)
136Ba
135.904
571(3)
0.078
54(24)
137Ba
136.905
822(3)
0.112
32(24)
138Ba
137.905
242(3)
0.716
98(42)
|
|
Inner
+
outer
Shells
|
|
|
Inner
+
outer
Orbitals
|
|
|
Filling
Orbital
|
|
Ground
State
Electron
Configuration
|
|
Groun
d
State
Electron
Configuration
with
free
Orbital
(n=30)
|
|
Ground
State
Electron
Config
uration
with
compressed
Orbitals (n=96)
|
|
|
|
|
Singularity
|
|
|
|
|
|
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
|
|
|
|
|
|
|
|
|
|
8
|
|
|
|
|
|
|
|
|
|
|
|
|
Term
Symbol
|
1S
0
|
|
Discovery
|
It
was
discovered
by
the
Swedish
pharmacist
and
chemist
Carl
Wilhelm
Scheele
in
1774
and
first
isolated
by
the
British
chemist
and
physicist
Humphry
Davy
(London,
England)
in
1808
|
|
Name
Derived
From
|
The
name
is
derived
from
the
Greek
barys
for
"heavy"
because
it
was
found
in
the
mineral
heavy
spar
(BaSO4).
|
|
![[Picture]](../images/aglarule.gif){kind=small}
