Thulium Element (Periodic Table)

Thulium

Thulium (Tm) is a chemical element of the periodic table, located in the period 6, and has the atomic number 69. It is the thirteenth element in the lanthanide series. It is a bright, silvery-gray metal, whose name comes from “Thule”, the ancient name for Scandinavia. It is not available freely in nature and is counted as one of the rare earth 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
– f block

FAQs on Thulium Element

Thulium
‣ What does the thulium look like?

Appearance: silvery grey
‣ Who discovered thulium? When was the element thulium discovered?

Discovery and first isolation: Per Teodor Cleve (1879)
‣ Location of thulium on the periodic table

Thulium Periodic Table

Location: Thulium is found in the sixth row of the periodic table, next to the erbium element.
‣ What’s the atomic mass number for thulium?

Atomic number (Z): 69
Thulium symbol: Tm
Thulium atomic weight: 168.934218
‣ What block is thulium in the periodic table?

Block: f-block
‣ What period is thulium on the periodic table?

Period: 6
Thulium atomic radius: empirical: 176 pm
Thulium covalent radius: 190±10 pm
Thulium melting point: 1818 K (1545 °C, 2813 °F)
Thulium boiling point: 2223 K (1950 °C, 3542 °F)
‣ How many electron shells does lithium have?

Electrons per shell: 2, 8, 18, 31, 8, 2
‣ What is the electron configuration of lithium?

Electron configuration: [Xe] 4f13 6s2
‣ What is lithium ionization energy?

Ionization energies:
1st: 596.7 kJ/mol
2nd: 1160 kJ/mol
3rd: 2285 kJ/mol
‣ Is lithium solid at room temperature?

Phase (at r.t): solid
‣ What is lithium’s density?

Density (near r.t): 9.32 g/cm3
when liquid (at m.p): 8.56 g/cm3
Lithium magnetic ordering: paramagnetic (at 300 K)
Lithium natural occurrence: primordial
Thulium oxidation state: +2, +3
‣ What is the electronegativity of lithium?

Electronegativity: Pauling scale: 1.25
Thulium poisson’s ratio: 0.213
Thulium heat of fusion: 16.84 kJ/mol
Thulium heat of vaporization: 191 kJ/mol
Thulium molar heat capacity: 27.03 J/(mol K)
Thulium molar magnetic susceptibility: +25500 × 10-6 cm3/mol (291 K)
‣ What is the crystal structure of thulium?

Crystal structure: hexagonal close-packed (hcp)
Thermal expansion of thulium: poly: 13.3 µm/(m.K) (at r.t)
Thermal conductivity of thulium: 16.9 W/(m.K)
Thulium electrical resistivity: poly: 676 nΩ.m (at r.t)
‣ Thulium hardness

Vickers hardness: 470-650 MPa
Brinell hardness: 470-900 MPa
Young’s modulus of thulium: 74.0 GPa
Shear modulus of thulium: 30.5 GPa
Bulk modulus of thulium: 44.5 GPa
Thulium CAS number: 7440-30-4

‣ Thulium vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)1117123513811570(1821)(2217)

‣ How many isotopes of thulium are there?

Main isotopes of thulium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
167Tmsyn9.25 dε167Er
168Tmsyn93.1 dε168Er
169Tm100 %stable
170Tmsyn128.6 dβ170Yb
171Tmsyn1.92 yβ171Yb

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