Periodic
Table
|
Dubnium
|
Symbol
|
Db
|
|
Atomic
Number
|
105
|
Relative
Atomic
Mass
12C
=
12.0000
|
[262
]
262.1141
|
|
Significant
Atomic
Mass
|
268
Neutrons
163
|
|
Atomic
Radius
pm
|
139
(est.)
|
First
Ionisation
Energy
kJ
mol
-1
|
640
(est.)
|
|
Electronegativity
|
-
|
|
Density
kg
m
-3
|
39000
|
|
Molar
Volume
cm
3
|
-
|
Thermal
Conductivity
W
m
-1
K
-1
|
-
|
|
Melting
Point
K
|
-
|
|
Boiling
Point
K
|
-
|
|
Number
of
Isotopes
|
9
|
|
262
Db
34
s
267
Db
?
268
Db
16
hours
!?
|
|
Inner
+
outer
Shells
|
|
|
Inner
+
outer
Orbitals
|
|
|
Filling
Orbital
|
|
|
Ground
State
Electron
Configuration
|
|
|
|
Ground
State
Electron
Configuration
with
free
Orbitals (n=13)
|
|
|
|
|
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
|
14
|
18
|
|
|
|
|
6
|
2
|
6
|
3
|
7
|
14
|
18
|
22
|
|
|
|
7
|
2
|
6
|
10
|
14
|
18
|
22
|
26
|
|
|
8
|
|
|
|
|
|
|
|
|
|
|
|
|
Term
Symbol
|
4F
3/2
|
|
|
260Db
and
261Db
were
initially
reported
by
a
group
of
scientists
at
Dubna,
Russia.
Discovery
confirmed
at
Berkeley,
USA
and
Dubna
in
1970.
Acknowledgment
of
the
discovery
is
shared
between
the
two
groups.
|
|
Obsolete
Names
|
Unnilpentium,
Unp
eka-tantalum
Hahnium,
Hn
Nielsbohrium,
Ns
joliotium,
Jl
|
The
name
preferred
by
the
Americans
was
"
hahnium,
Hn".
|
The
name
preferred
by
the
Russians
was
"
nielsbohrium,
".
|
In
1994,
the
IUPAC
proposed
"
joliotium,
Jl"
Finally
in
1997,
the
name
was
agreed
to
dubnium
|
|
Name
Derived
From
|
Named
after
Dubna
|
To
avoid
confusion
in
the
literature,
when
a
name
has
been
in
unofficial
use
for
a
particular
element,
but
a
different
name
is
ultimately
chosen
for
a
element,
then
the
first
name
cannot
be
transferred
for
another
element.
A
case
in
point
is
element
105
for
wich
the
name
hahnium
has
been
unofficially
used.
Since
the
name
dubnium
was
chosen
for
that
element,
hahnium
cannot
be
used
for
another
as
yet
unnamed
element.
|
|
