Technetium Element (Periodic Table)

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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 yβ–99Ru
95Tcsyn6.01 hIT
γ		99Tc
–

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