Periodic
Table
|
Einsteinium
|
Symbol
|
Es
|
|
Atomic
Number
|
99
|
Relative
Atomic
Mass
12C
=
12.0000
|
[
252
]
252.0830
472(2)
day
|
|
Significant
Atomic
Mass
|
252
Neutrons
153
|
|
Atomic
Radius
pm
|
203
|
First
Ionisation
Energy
kJ
mol
-1
|
619
|
|
Electronegativity
|
1.3
|
|
Density
kg
m
-3
|
-
|
|
Molar
Volume
cm
3
|
-
|
Thermal
Conductivity
W
m
-1
K
-1
|
10
[300
K]
(est.)
|
|
Melting
Point
K
|
1130
±
30
|
|
Boiling
Point
K
|
-
|
|
Number
of
Isotopes
|
17
|
|
Inner + outer
Shells
|
|
|
Inner + outer
Orbitals
|
|
|
Filling
Orbital
|
|
|
Ground
State
Electron
Configuration
|
|
|
|
Ground
State
Electron
Configuration with
free Orbitals (n= 19
)
|
|
|
|
|
Ground
State
Electron
Configuration
with
compressed
Orbitals
(n=
162
)
|
|
|
|
|
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
|
11
|
3
|
18
|
|
|
|
|
6
|
2
|
6
|
10
|
14
|
18
|
22
|
|
|
|
7
|
2
|
6
|
10
|
14
|
18
|
22
|
26
|
|
|
8
|
|
|
|
|
|
|
|
|
|
|
|
|
Term
Symbol
|
5I
15/2
|
|
Discovery
|
Discovered
by G.R. Choppin, S.G.
Thompson,
A.
Ghiorso
and B.G.
Harvey
in
the
deris
of
the
thermonuclear
explosion
in
the
Pacific
in
1952
|
|
Name
Derived
From
|
Named
after
Albert
Einstein
|
|