Dubnium Element (Periodic Table)

Dubnium

Dubnium (Db) is a chemical element of the periodic table, located in the group 5 and the period 7, and has the atomic number 105. It is a silvery-white transition metal, which is named after Dubna, a town in Moscow Oblast, Russia. It is a transuranium element and is counted as one of the radioactive elements.

group
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
period
1
1
H
2
He
2
3
Li
4
Be
5
B
6
C
7
N
8
O
9
F
10
Ne
3
11
Na
12
Mg
13
Al
14
Si
15
P
16
S
17
Cl
18
Ar
4
19
K
20
Ca
21
Sc
22
Ti
23
V
24
Cr
25
Mn
26
Fe
27
Co
28
Ni
29
Cu
30
Zn
31
Ga
32
Ge
33
As
34
Se
35
Br
36
Kr
5
37
Rb
38
Sr
39
Y
40
Zr
41
Nb
42
Mo
43
Tc
44
Ru
45
Rh
46
Pd
47
Ag
48
Cd
49
In
50
Sn
51
Sb
52
Te
53
I
54
Xe
6
55
Cs
56
Ba
72
Hf
73
Ta
74
W
75
Re
76
Os
77
Ir
78
Pt
79
Au
80
Hg
81
Tl
82
Pb
83
Bi
84
Po
85
At
86
Rn
7
87
Fr
88
Ra
104
Rf
105
Db
106
Sg
107
Bh
108
Hs
109
Mt
110
Ds
111
Rg
112
Cn
113
Nh
114
Fl
115
Mc
116
Lv
117
Ts
118
Og
57
La
58
Ce
59
Pr
60
Nd
61
Pm
62
Sm
63
Eu
64
Gd
65
Tb
66
Dy
67
Ho
68
Er
69
Tm
70
Yb
71
Lu
89
Ac
90
Th
91
Pa
92
U
93
Np
94
Pu
95
Am
96
Cm
97
Bk
98
Cf
99
Es
100
Fm
101
Md
102
No
103
Lr
d
block

FAQs on Dubnium Element

Dubnium
‣ Who discovered dubnium? When was dubnium discovered?

Discovery: independently by the Lawrence Berkeley Laboratory and the Joint Institute for Nuclear Research (1970)
‣ Where is dubnium on the periodic table?

Dubnium Periodic Table

Location: Dubnium is found in the fifth column of the periodic table, next to the rutherfordium element.
‣ What is dubnium atomic mass number?

Atomic number (Z): 105
‣ Which symbol correctly represents element dubnium?

Symbol: Db
‣ What is the atomic weight for dubnium?

Standard atomic weight: [268]
‣ What block is dubnium in the periodic table?

Block: d-block
‣ What group is dubnium in the periodic table?

Group: 5
‣ What period is dubnium on the periodic table?

Period: 7
Dubnium atomic radius: empirical: 139 pm (estimated)
Dubnium covalent radius: 149 pm (estimated)
‣ How many electron shells does dubnium have?

Electrons per shell: 2, 8, 18, 32, 32, 11, 2
‣ What is the electron configuration of dubnium?

Electron configuration: [Rn] 5f14 6d3 7s2
Dubnium ionization energies:
1st: 665 kJ/mol
2nd: 1547 kJ/mol
3rd: 2378 kJ/mol
‣ What state is dubnium at room temperature?

Phase (at r.t): solid (predicted)
‣ What is the density of the element dubnium?

Density (near r.t): 21.6 g/cm3 (predicted)
Dubnium natural occurrence: synthetic
Dubnium oxidation state: +3, +4, +5
‣ What is the crystal structure of dubnium?

Crystal structure: body-centered cubic (bcc) (predicted)
Dubnium CAS number: 53850-35-4

‣ How many isotopes does dubnium have?

Main isotopes of dubnium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
262Dbsyn34 s67 % α
33 % SF
258Lr
263Dbsyn27 s56 % SF
41 % α
3 % ε


259Lr
263Rf
266Dbsyn20 minSF
ε?


266Rf
267Dbsyn1.2 hSF
ε?


267Rf
268Dbsyn28 hSF
ε?
α


268Rf
264Lr
270Dbsyn15 h17 % SF
83 % α
ε?


266Lr
270Rf

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