Thallium Element (Periodic Table)

Thallium

Thallium (Tl) is a chemical element of the periodic table, located in the group 13 and the period 6, and has the atomic number 81. It is a soft, malleable, lustrous, silvery-grey post transition metal, whose name comes from the Greek word “thallos”, which means green twig. It is highly toxic and is not available freely in nature. It is a member of the boron group.

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
– p block

FAQs on Thallium Element

Thallium
‣ What does thallium look like?

Appearance: silvery white
‣ Who discovered thallium? When was the element thallium discovered?

Discovery: William Crookes (1861)
First isolation: Claude-Auguste Lamy (1862)
‣ Where is thallium located on the periodic table?

Thallium Periodic Table

Location: Thallium is found in the sixth row of the periodic table below the indium element.
‣ What is the atomic number for thallium?

Atomic number (Z): 81
‣ What is thallium symbol?

Symbol: Tl
Thallium atomic weight: [204.382, 204.385] conventional: 204.38
‣ What block is thallium in the periodic table?

Block: p-block
‣ What group does thallium belong to?

Group: 13 (boron group)
‣ What period is thallium on the periodic table?

Period: 6
Thallium atomic radius: empirical: 170 pm
Thallium covalent radius: 145±7 pm
Thallium Van der Waals radius: 196 pm
‣ What is thallium melting point?

Melting point: 577 K (304 °C, 579 °F)
‣ What is the boiling point of thallium?

Boiling point: 1746 K (1473 °C, 2683 °F)
‣ How many electron shells does thallium have?

Electrons per shell: 2, 8, 18, 32, 18, 3
‣ What is the electron configuration of thallium?

Electron configuration: [Xe] 4f14 5d10 6s2 6p1
Thallium ionization energies:
1st: 589.4 kJ/mol
2nd: 1971 kJ/mol
3rd: 2878 kJ/mol
‣ What is the phase of thallium?

Phase (at r.t): solid
Thallium density (near r.t): 11.85 g/cm3
when liquid (at m.p): 11.22 g/cm3
Thallium magnetic ordering: diamagnetic
Thallium natural occurrence: primordial
‣ What is the oxidation state of thallium?

Oxidation state: +1, +3
‣ What’s the electronegativity of thallium?

Electronegativity: Pauling scale: 1.62
Thallium poisson’s ratio: 0.45
Thallium heat of fusion: 4.14 kJ/mol
Thallium heat of vaporization: 165 kJ/mol
Thallium molar heat capacity: 26.32 J/(mol K)
Thallium molar magnetic susceptibility: -50.9 × 10-6 cm3/mol (298 K)
Speed of sound in thallium: 818 m/s (at 20 °C)
‣ What is the crystal structure of thallium?

Crystal structure: hexagonal close-packed (hcp)
Thermal expansion of thallium: 29.9 µm/(m.K) (at 25 °C)
Thermal conductivity of thallium: 46.1 W/(m.K)
Thallium electrical resistivity: 0.18 nΩ.m (at 20 °C)
‣ Thallium hardness

Mohs hardness: 1.2
Brinell hardness: 26.5-44.7 MPa
Young’s modulus of thallium: 8 GPa
Shear modulus of thallium: 2.8 GPa
Bulk modulus of thallium: 43 GPa
Thallium CAS number: 7440-28-0

‣ Thallium vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)8829771097125214611758

‣ How many isotopes does thallium have?

Main isotopes of thallium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
203Tl29.5 %stable
204Tlsyn3.78 yβ
ε
204Pb
204Hg
205Tl70.5 %stable

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