Hafnium Element (Periodic Table)

Hafnium

Hafnium (Hf) is a chemical element of the periodic table, located in the group 4 and the period 6, and is having the atomic number 72. It is a ductile, lustrous, silvery-grey transition metal, which is named after Hafnia, the Latin name for Copenhagen, the city where it was discovered.

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 Hafnium Element

Hafnium
‣ What does hafnium look like?

Appearance: steel grey
‣ Who discovered hafnium? When was hafnium discovered?

Prediction: Dmitri Mendeleev (1869)
Discovery and first isolation: Dirk Coster and George de Hevesy (1922)
‣ Where is hafnium on the periodic table?

Hafnium Periodic Table

Location: Hafnium is found in the fourth column of the periodic table, below the zirconium element.
‣ What’s the atomic mass number for hafnium?

Atomic number (Z): 72
Hafnium symbol: Hf
Hafnium atomic weight: 178.486
‣ Hafnium is which block element?

Block: d-block
‣ What is the group number of the element hafnium?

Group: 4
‣ Period of hafnium in the periodic table

Period: 6
‣ What is the atomic radius of hafnium?

Atomic radius: empirical: 159 pm
Hafnium covalent radius: 175±10 pm
‣ What is hafnium’s melting point?

Melting point: 2506 K (2233 °C, 4051 °F)
‣ What is the boiling point of hafnium?

Boiling point: 4876 K (4603 °C, 8317 °F)
‣ How many electron shells does hafnium have?

Electrons per shell: 2, 8, 18, 32, 10, 2
‣ What is the electron configuration of hafnium?

Electron configuration: [Xe] 4f14 5d2 6s2
Hafnium ionization energies:
1st: 658.5 kJ/mol
2nd: 1440 kJ/mol
3rd: 2250 kJ/mol
‣ What is the phase of hafnium?

Phase (at r.t): solid
Hafnium density (near r.t): 13.31 g/cm3
when liquid (at m.p): 12 g/cm3
Hafnium magnetic ordering: paramagnetic
Hafnium natural occurrence: primordial
Hafnium oxidation state: +4
‣ What’s the electronegativity of hafnium?

Electronegativity: Pauling scale: 1.3
Hafnium poisson’s ratio: 0.37
Hafnium heat of fusion: 27.2 kJ/mol
Hafnium heat of vaporization: 648 kJ/mol
Hafnium molar heat capacity: 25.73 J/(mol K)
Hafnium molar magnetic susceptibility: +75.0 × 10-6 cm3/mol (at 298 K)
Speed of sound in hafnium: 3010 m/s (at 20 °C)
‣ What is the crystal structure of hafnium?

Crystal structure: hexagonal close-packed (hcp)
Thermal expansion of hafnium: 5.9 µm/(m.K) (at 25 °C)
Thermal conductivity of hafnium: 23.0 W/(m.K)
Hafnium electrical resistivity: 331 nΩ.m (at 20 °C)
‣ Hafnium hardness

Vickers hardness: 1520-2060 MPa
Brinell hardness: 1450-2100 MPa
Young’s modulus of hafnium: 78 GPa
Shear modulus of hafnium: 30 GPa
Bulk modulus of hafnium: 110 GPa
Hafnium CAS number: 7440-58-6

‣ Hafnium vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)268929543277367941944876

‣ How many isotopes does hafnium have?

Main isotopes of hafnium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
172Hfsyn1.87 yε172Lu
174Hf0.16 %2 × 1015 yα170Yb
176Hf5.26 %stable
177Hf18.60 %stable
178Hf27.28 %stable
178Hfsyn31 yIT178Hf
179Hf13.62 %stable
180Hf35.08 %stable
182Hfsyn8.9 × 106 yβ182Ta

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