Technetium Element (Periodic Table)

Technetium

Technetium (Tc) is a chemical element of the periodic table, located in the group 7 and the period 5, and has the atomic number 43. It is a rare, silvery-grey transition metal, whose name comes from the Greek word “technetos”, which means artificial. It 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 Technetium Element

Technetium
‣ What does technetium look like?

Appearance: shiny gray metal
‣ Who discovered technetium and in what year?

Prediction: Dmitri Mendeleev (1871)
Discovery and first isolation: Emilio Sergre and Carlo Perrier (1937)
‣ Where is technetium found on the periodic table?

Technetium Periodic Table

Location: Technetium is found in the seventh column of the periodic table, next to the molybdenum element.
‣ What is the atomic number of technetium?

Atomic number (Z): 43
‣ What is technetium’s symbol?

Symbol: Tc
‣ What is the atomic weight of technetium?

Standard atomic weight: [97]
‣ Which block does technetium belong to?

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

Group: 7
‣ What period is technetium on the periodic table?

Period: 5
Technetium atomic radius: empirical: 136 pm
Technetium covalent radius: 147±7 pm
‣ What is the melting point of technetium?

Melting point: 2430 K (2157 °C, 3915 °F)
‣ What is technetium boiling point?

Boiling point: 4538 K (4265 °C, 7709 °F)
‣ How many electron shells does technetium have?

Electrons per shell: 2, 8, 18, 13, 2
‣ What is the electron configuration of technetium?

Electron configuration: [Kr] 4d5 5s2
Technetium ionization energies:
1st: 702 kJ/mol
2nd: 1470 kJ/mol
3rd: 2850 kJ/mol
‣ What is the phase of technetium?

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

Density (near r.t): 11 g/cm3
Technetium magnetic ordering: paramagnetic
Technetium natural occurrence: from decay
Technetium oxidation state: +4, +6, +7
Technetium electronegativity: Pauling scale: 1.9
Technetium heat of fusion: 33.29 kJ/mol
Technetium heat of vaporization: 585.2 kJ/mol
Technetium molar heat capacity: 24.27 J/(mol K)
Technetium molar magnetic susceptibility: +270.0 × 10-6 cm3/mol (298 K)
Speed of sound in technetium: 16,200 m/s (at 20 °C)
‣ What is the crystal structure of technetium?

Crystal structure: hexagonal close-packed (hcp)
Thermal expansion of technetium: 7.1 µm/(m.K) (at r.t)
Thermal conductivity of technetium: 50.6 W/(m.K)
Technetium electrical resistivity: 200 nΩ.m (at 20 °C)
Technetium CAS number: 7440-26-8

‣ Technetium vapor pressure

Vapor pressure (extrapolated)
P (Pa)1101001 k10 k100 k
at T (K)272729983324372642344894

‣ How many isotopes does technetium have?

Main isotopes of technetium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
95Tcsyn61 dε
γ
IT
95Mo

95Tc
96Tcsyn4.3 dε
γ
96Mo
97Tcsyn4.21 × 106 yε97Mo
97Tcsyn91 dIT97Tc
98Tcsyn4.2 × 106 yβ
γ
98Ru
99Tctrace2.111 × 105 yβ99Ru
95Tcsyn6.01 hIT
γ
99Tc

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