Hafnium (Hf)

Hafnium is the 72nd element in the periodic table and has a symbol of Hf and atomic number of 72. It has an atomic weight of 178.49 and a mass number of 180. Hafnium has seventy-two protons and one hundred eight neutrons in its nucleus, and seventy-two electrons in six shells. It is located in group four, period six and block d of the periodic table. Silvery lustrous metallic transition element. Used in tungsten alloys in filaments and electrodes, also acts as a neutron absorber. First reported by Urbain in 1911, existence was finally established in 1923 by D. Coster, G.C. de Hevesy in 1923.

Atomic Number	72
Atomic Weight	178.49
Mass Number	180

Group	4
Period	6
Block	d

Protons	72 p⁺
Neutrons	108 n⁰
Electrons	72 e^-

Properties

Physical Properties
Atomic Radius	155 pm 264 pm
Molar Volume	13.6 cm³/mol
Covalent Radius	152 pm 128 pm 122 pm 175 pm
Metallic Radius	144 pm 159 pm
Ionic Radius	58 pm 71 pm 76 pm 83 pm
Crystal Radius	72 pm 85 pm 90 pm 97 pm
Van der Waals Radius	225 pm 223 pm 253 pm 314.1 pm
Density	13.3 g/cm³ 12,000 kg/m³
Energy
Proton Affinity
Electron Affinity	0.014 eV/particle
Ionization Energy	6.82507 eV/particle 15 eV/particle 23.28 eV/particle 33.37 eV/particle 68.375 eV/particle 98 eV/particle 118 eV/particle 138 eV/particle 157 eV/particle 187 eV/particle 209 eV/particle 230 eV/particle 270 eV/particle 310 eV/particle 334 eV/particle 359 eV/particle 399 eV/particle 440 eV/particle 481 eV/particle 520 eV/particle 560 eV/particle 610 eV/particle 650 eV/particle 690 eV/particle 730 eV/particle 772 eV/particle 1,002 eV/particle 1,047 eV/particle 1,094 eV/particle 1,146 eV/particle 1,195 eV/particle 1,245 eV/particle 1,311 eV/particle 1,362 eV/particle 1,417 eV/particle 1,467 eV/particle 1,669 eV/particle 1,719 eV/particle 1,776 eV/particle 1,827 eV/particle 1,963 eV/particle 2,022 eV/particle 2,159 eV/particle 2,218.9 eV/particle 3,741 eV/particle 3,858 eV/particle 3,984 eV/particle 4,118 eV/particle 4,246 eV/particle 4,372 eV/particle 4,573 eV/particle 4,703 eV/particle 4,846 eV/particle 4,980 eV/particle 5,350 eV/particle 5,468 eV/particle 5,595 eV/particle 5,713 eV/particle 6,149 eV/particle 6,284 eV/particle 6,545 eV/particle 6,674 eV/particle 14,678 eV/particle 14,999 eV/particle 15,351 eV/particle 15,680 eV/particle 17,280 eV/particle 17,680 eV/particle 18,180 eV/particle 18,502.32 eV/particle 74,565.93 eV/particle 76,077.8 eV/particle

Heat of Vaporization	575 kJ/mol
Heat of Fusion	25.1 kJ/mol
Heat of Formation	618.4 kJ/mol
Electrons
Electron Shells	2, 8, 18, 32, 10, 2

Valence Electrons	2
Electron Configuration	[Xe] 4f¹⁴ 5d² 6s²

Oxidation States	-2, 0, 1, 2, 3, 4
Electronegativity	6.83 eV/particle 0.229987 1.3
Electrophilicity	0.8583981383413326 eV/particle
Phases
Phase	Solid
Gas Phase
Boiling Point	4,873.15 K
Melting Point	2,506.15 K
Critical Pressure
Critical Temperature
Triple Point
Visual
Hafnium is a Gray. Hf has a CPK of #ff1493, Jmol of #4dc2ff, and MOLCAS GV of #4dc2ff. The Appearance of Element 72 is steel gray.
Color	Gray #ff1493 #4dc2ff #4dc2ff
Appearance	steel gray
Refractive Index
Thermodynamic Properties
Thermal Conductivity	23 W/(m K)
Thermal Expansion	0.0000059 1/K
Molar Heat Capacity	25.73 J/(mol K)
Specific Heat Capacity	0.144 J/(g⋅K)
Heat Capacity Ratio (Adiabatic Index)
Electrical Properties
Type	Conductor
Electrical Conductivity	3.3 MS/m
Electrical Resistivity	0.0000003 m Ω
Superconducting Point	0.128 K
Magnetism
Type	paramagnetic
Magnetic Susceptibility (Mass)	0.0000000053 m³/Kg
Magnetic Susceptibility (Molar)	0.000000000946 m³/mol
Magnetic Susceptibility (Volume)	0.0000705
Magnetic Ordering
Curie Point
Neel Point
Structure
The Crystal Structure of Hafnium is HEX. The lattice constant of Hf is 3.2 Å. The lattice angles of Element 72 are π/2, π/2, 2 π/3.
Crystal Structure	Simple Hexagonal (HEX)
Lattice Constant	3.2 Å
Lattice Angles	π/2, π/2, 2 π/3
Mechanical Properties
Hafnium has a Brinell of 1700 MPa, Mohs hardness of 5.5 MPa, and Vickers of 1760 MPa. The Bulk Modulus of Hf is 110 GPa. The Shear Modulus of Element 72 is 30 GPa. The Young Modulus of Hafnium (Hf) is 78 GPa. The Poisson Ratio of Hafnium is 0.37. The Speed of Sound of Hf is 3010 m/s.
Hardness	1,700 MPa 5.5 MPa 1,760 MPa
Bulk Modulus	110 GPa
Shear Modulus	30 GPa
Young Modulus	78 GPa
Poisson Ratio	0.37
Speed of Sound	3,010 m/s
Classification
The CAS Group of Hafnium is IVA. The IUPAC Group of Hf is IVB. The Glawe Number of Element 72 is 50. The Mendeleev Number of Hafnium (Hf) is 45. The Pettifor Number of Hafnium is 50. The Geochemical Class of Hf is high field strength. The Goldschmidt Class of Element 72 is litophile.
Category	Transition metals, Transition metals
CAS Group	IVA
IUPAC Group	IVB
Glawe Number	50
Mendeleev Number	45
Pettifor Number	50
Geochemical Class	high field strength
Goldschmidt Class	litophile
Other
The Dipole Polarizability of Hafnium is 103 plus or minus 6 a₀. Hf has a C6 Dispersion Coefficient (GB) of 1040 a₀. The Allotropes of Element 72 is . The Neutron Cross Section of Hafnium (Hf) is 104. The Neutron Mass Absorption of Hafnium is 0.02. The Quantum Numbers of Hf is 3F2. The Space Group of Element 72 is 194 (P63/mmc).
Gas Basicity
Dipole Polarizability	103 ± 6 a₀
C6 Dispersion Coefficient	1,040 a₀
Allotropes
Neutron Cross Section	104
Neutron Mass Absorption	0.02
Quantum Numbers	3F2
Space Group	194 (P63/mmc)

Isotopes of Hafnium

Stable Isotopes	6
Unstable Isotopes	32
Radioactive Isotopes	33

¹⁵³Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	152.970692 ± 0.000322 Da
Mass Number	153
G-Factor
Half Life
Spin	1/2
Quadrupole Moment	0
Discovery Year	2000
Parity	+

¹⁵³Hf Decay Modes

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	%

¹⁵⁴Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	153.964863 ± 0.000322 Da
Mass Number	154
G-Factor	0
Half Life	2 ± 1 s
Spin	0
Quadrupole Moment	0
Discovery Year	1981
Parity	+

¹⁵⁴Hf Decay Modes

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)	0%

¹⁵⁵Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	154.963167 ± 0.000322 Da
Mass Number	155
G-Factor
Half Life	843 ± 30 ms
Spin	7/2
Quadrupole Moment
Discovery Year	1981
Parity	-

¹⁵⁵Hf Decay Modes

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)	%

¹⁵⁶Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	155.959399083 ± 0.000160752 Da
Mass Number	156
G-Factor	0
Half Life	23 ± 1 ms
Spin	0
Quadrupole Moment	0
Discovery Year	1979
Parity	+

¹⁵⁶Hf Decay Modes

Decay Mode	Intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	%

¹⁵⁷Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	156.958288 ± 0.000215 Da
Mass Number	157
G-Factor
Half Life	115 ± 1 ms
Spin	7/2
Quadrupole Moment
Discovery Year	1965
Parity	-

¹⁵⁷Hf Decay Modes

Decay Mode	Intensity
α (α emission)	94%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	14%

¹⁵⁸Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	157.954801217 ± 0.00001878 Da
Mass Number	158
G-Factor	0
Half Life	2.85 ± 0.07 s
Spin	0
Quadrupole Moment	0
Discovery Year	1965
Parity	+

¹⁵⁸Hf Decay Modes

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	55.7%
α (α emission)	44.3%

¹⁵⁹Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	158.953995837 ± 0.000018049 Da
Mass Number	159
G-Factor
Half Life	5.2 ± 0.1 s
Spin	7/2
Quadrupole Moment
Discovery Year	1973
Parity	-

¹⁵⁹Hf Decay Modes

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	65%
α (α emission)	35%

¹⁶⁰Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	159.950682728 ± 0.000010241 Da
Mass Number	160
G-Factor	0
Half Life	13.6 ± 0.2 s
Spin	0
Quadrupole Moment	0
Discovery Year	1973
Parity	+

¹⁶⁰Hf Decay Modes

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	99.3%
α (α emission)	0.7%

¹⁶¹Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	160.950277927 ± 0.000025174 Da
Mass Number	161
G-Factor
Half Life	18.4 ± 0.4 s
Spin	7/2
Quadrupole Moment
Discovery Year	1973
Parity	-

¹⁶¹Hf Decay Modes

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	99.71%
α (α emission)	0.29%

¹⁶²Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	161.947215526 ± 0.00000961 Da
Mass Number	162
G-Factor	0
Half Life	39.4 ± 0.9 s
Spin	0
Quadrupole Moment	0
Discovery Year	1982
Parity	+

¹⁶²Hf Decay Modes

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	99.992%
α (α emission)	0.008%

¹⁶³Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	162.947107211 ± 0.000027582 Da
Mass Number	163
G-Factor
Half Life	40 ± 0.6 s
Spin	5/2
Quadrupole Moment
Discovery Year	1982
Parity	-

¹⁶³Hf Decay Modes

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)	%

¹⁶⁴Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	163.944370709 ± 0.000016975 Da
Mass Number	164
G-Factor	0
Half Life	111 ± 8 s
Spin	0
Quadrupole Moment	0
Discovery Year	1981
Parity	+

¹⁶⁴Hf Decay Modes

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

¹⁶⁵Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	164.944567 ± 0.00003 Da
Mass Number	165
G-Factor
Half Life	76 ± 4 s
Spin	5/2
Quadrupole Moment
Discovery Year	1981
Parity	-

¹⁶⁵Hf Decay Modes

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

¹⁶⁶Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	165.94218 ± 0.00003 Da
Mass Number	166
G-Factor	0
Half Life	6.77 ± 0.3 m
Spin	0
Quadrupole Moment	0
Discovery Year	1965
Parity	+

¹⁶⁶Hf Decay Modes

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

¹⁶⁷Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	166.9426 ± 0.00003 Da
Mass Number	167
G-Factor
Half Life	2.05 ± 0.05 m
Spin	5/2
Quadrupole Moment
Discovery Year	1969
Parity

¹⁶⁷Hf Decay Modes

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

¹⁶⁸Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	167.940568 ± 0.00003 Da
Mass Number	168
G-Factor	0
Half Life	25.95 ± 0.2 m
Spin	0
Quadrupole Moment	0
Discovery Year	1961
Parity	+

¹⁶⁸Hf Decay Modes

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
ϵ (electron capture)	98%
e⁺ (positron emission)	2%

¹⁶⁹Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	168.941259 ± 0.00003 Da
Mass Number	169
G-Factor
Half Life	3.24 ± 0.04 m
Spin	5/2
Quadrupole Moment
Discovery Year	1969
Parity	-

¹⁶⁹Hf Decay Modes

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

¹⁷⁰Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	169.939609 ± 0.00003 Da
Mass Number	170
G-Factor	0
Half Life	16.01 ± 0.13 h
Spin	0
Quadrupole Moment	0
Discovery Year	1961
Parity	+

¹⁷⁰Hf Decay Modes

Decay Mode	Intensity
ϵ (electron capture)	100%

¹⁷¹Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	170.940492 ± 0.000031 Da
Mass Number	171
G-Factor	-0.19257142857143 ± 0.0034285714285714
Half Life	12.1 ± 0.4 h
Spin	7/2
Quadrupole Moment	3.46 ± 0.03
Discovery Year	1951
Parity	+

¹⁷¹Hf Decay Modes

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

¹⁷²Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	171.939449716 ± 0.000026224 Da
Mass Number	172
G-Factor	0
Half Life	1.87 ± 0.03 y
Spin	0
Quadrupole Moment	0
Discovery Year	1951
Parity	+

¹⁷²Hf Decay Modes

Decay Mode	Intensity
ϵ (electron capture)	100%

¹⁷³Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	172.940513 ± 0.00003 Da
Mass Number	173
G-Factor	1.004 ± 0.014
Half Life	23.6 ± 0.1 h
Spin	1/2
Quadrupole Moment	0
Discovery Year	1951
Parity	-

¹⁷³Hf Decay Modes

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

¹⁷⁴Hf

Abundance	Radioactive ☢️ 0.16 ± 0.12
Relative Atomic Mass	173.940048377 ± 0.000002425 Da
Mass Number	174
G-Factor	0
Half Life	2 ± 0.4 Py
Spin	0
Quadrupole Moment	0
Discovery Year	1939
Parity	+

¹⁷⁴Hf Decay Modes

Decay Mode	Intensity
α (α emission)	100%
2β⁺ (double β⁺ decay)	%

¹⁷⁵Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	174.941511424 ± 0.00000245 Da
Mass Number	175
G-Factor	-0.2708 ± 0.0036
Half Life	70.65 ± 0.19 d
Spin	5/2
Quadrupole Moment	2.72 ± 0.02
Discovery Year	1949
Parity	-

¹⁷⁵Hf Decay Modes

Decay Mode	Intensity
ϵ (electron capture)	100%

¹⁷⁶Hf

Abundance	5.26 ± 0.7
Relative Atomic Mass	175.941409797 ± 0.000001591 Da
Mass Number	176
G-Factor	0
Half Life
Spin	0
Quadrupole Moment	0
Discovery Year	1934
Parity	+

¹⁷⁷Hf

Abundance	18.6 ± 0.16
Relative Atomic Mass	176.943230187 ± 0.000001514 Da
Mass Number	177
G-Factor	0.226 ± 0.00025714285714286
Half Life
Spin	7/2
Quadrupole Moment	3.37 ± 0.03
Discovery Year	1934
Parity	-

¹⁷⁸Hf

Abundance	27.28 ± 0.28
Relative Atomic Mass	177.943708322 ± 0.000001519 Da
Mass Number	178
G-Factor	0
Half Life
Spin	0
Quadrupole Moment	0
Discovery Year	1934
Parity	+

¹⁷⁹Hf

Abundance	13.62 ± 0.11
Relative Atomic Mass	178.945825705 ± 0.00000152 Da
Mass Number	179
G-Factor	-0.14197777777778 ± 0.00031111111111111
Half Life
Spin	9/2
Quadrupole Moment	3.79 ± 0.03
Discovery Year	1934
Parity	+

¹⁸⁰Hf

Abundance	35.08 ± 0.33
Relative Atomic Mass	179.946559537 ± 0.000001525 Da
Mass Number	180
G-Factor	0
Half Life
Spin	0
Quadrupole Moment	0
Discovery Year	1934
Parity	+

¹⁸¹Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	180.949110834 ± 0.000001527 Da
Mass Number	181
G-Factor
Half Life	42.39 ± 0.06 d
Spin	1/2
Quadrupole Moment	0
Discovery Year	1935
Parity	-

¹⁸¹Hf Decay Modes

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

¹⁸²Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	181.950563684 ± 0.000006619 Da
Mass Number	182
G-Factor	0
Half Life	8.9 ± 0.09 My
Spin	0
Quadrupole Moment	0
Discovery Year	1961
Parity	+

¹⁸²Hf Decay Modes

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

¹⁸³Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	182.953533203 ± 0.000032251 Da
Mass Number	183
G-Factor
Half Life	1.018 ± 0.002 h
Spin	3/2
Quadrupole Moment
Discovery Year	1956
Parity	-

¹⁸³Hf Decay Modes

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

¹⁸⁴Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	183.955448507 ± 0.000042625 Da
Mass Number	184
G-Factor	0
Half Life	4.12 ± 0.05 h
Spin	0
Quadrupole Moment	0
Discovery Year	1973
Parity	+

¹⁸⁴Hf Decay Modes

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

¹⁸⁵Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	184.958862 ± 0.000069 Da
Mass Number	185
G-Factor
Half Life	3.5 ± 0.6 m
Spin	9/2
Quadrupole Moment
Discovery Year	1993
Parity	-

¹⁸⁵Hf Decay Modes

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

¹⁸⁶Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	185.960897 ± 0.000055 Da
Mass Number	186
G-Factor	0
Half Life	2.6 ± 1.2 m
Spin	0
Quadrupole Moment	0
Discovery Year	1998
Parity	+

¹⁸⁶Hf Decay Modes

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

¹⁸⁷Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	186.964573 ± 0.000215 Da
Mass Number	187
G-Factor
Half Life
Spin	9/2
Quadrupole Moment
Discovery Year	1999
Parity	-

¹⁸⁷Hf Decay Modes

Decay Mode	Intensity
β⁻ (β⁻ decay)	%

¹⁸⁸Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	187.966903 ± 0.000322 Da
Mass Number	188
G-Factor	0
Half Life
Spin	0
Quadrupole Moment	0
Discovery Year	1999
Parity	+

¹⁸⁸Hf Decay Modes

Decay Mode	Intensity
β⁻ (β⁻ decay)	%

¹⁸⁹Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	188.970853 ± 0.000322 Da
Mass Number	189
G-Factor
Half Life
Spin	3/2
Quadrupole Moment
Discovery Year	2009
Parity	-

¹⁸⁹Hf Decay Modes

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

¹⁹⁰Hf

Abundance	Radioactive ☢️
Relative Atomic Mass	189.973376 ± 0.000429 Da
Mass Number	190
G-Factor	0
Half Life
Spin	0
Quadrupole Moment	0
Discovery Year	2012
Parity	+

¹⁹⁰Hf Decay Modes

Decay Mode	Intensity
β⁻ (β⁻ decay)	%

History

In 1911, Georges Urbain claimed to have found the element in rare-earth residues which was shown later to be a mixture of already discovered lanthanides. Dirk Coster and George de Hevesy found it by X-ray spectroscopic analysis in Norwegian zircon in 1922. Anton Eduard van Arkel and Jan Hendrik de Boer were the first to prepare metallic hafnium by passing hafnium tetra-iodide vapor over a heated tungsten filament in 1924. From Hafinia, the Latin name for Copenhagen

Discoverers	Dirk Coster, Georg von Hevesy
Discovery Location	Denmark
Discovery Year	1923
Etymology (Name Origin)	From Hafnia, the Latin name of Copenhagen.
Pronunciation	HAF-ni-em (English)

Hafnium is considered to be non-toxic

In powdered form, hafnium is pyrophoric and can ignite spontaneously in air

Uses

Hafnium oxide-based compounds are being introduced into silicon-based chips to produce smaller, more energy efficient and performance packed processors. Most of the hafnium produced is used in the production of control rods for nuclear reactors. Hafnium is also used in photographic flash bulbs, light bulb filaments, and in electronic equipment as cathodes and capacitors. Used in reactor control rods because of its ability to absorb neutrons.

Sources

Obtained from mineral zircon or baddeleyite.

Abundance
Abundance in Earth's crust	3 mg/kg
Abundance in Oceans	0.000007 mg/L
Abundance in Human Body
Abundance in Meteor	0.000017 %
Abundance in Sun	0.0000001 %
Abundance in Universe	0.00000007 %

Nuclear Screening Constants

1	s	1.3984
2	p	4.4012
2	s	18.8102
3	d	13.5702
3	p	21.0168
3	s	21.6885
4	d	36.476
4	f	39.7904
4	p	34.0704
4	s	33.0228
5	d	55.3805
5	p	52.415
5	s	50.167
6	s	62.8356

Hafnium on ChemicalAid

Australian Educational Vocabulary ID	scot/3526
CAS Registry Number	7440-58-6
CPV Supplementary	AA25
ChEBI ID	33343
ChemSpider ID	22422
Common Procurement Vocabulary	14753000
DSSTOX compound identifier	DTXCID5047663
DSSTox substance ID	DTXSID8064698
Den Store Danske ID	hafnium
ECHA Substance Infocard ID	100.028.333
Elhuyar ZTH ID	024890
Encyclopædia Britannica Online ID	science/hafnium
Encyclopædia Universalis ID	hafnium
Encyclopædia Universalis ID	zirconium-et-hafnium
Freebase ID	/m/025rtjj
GND ID	4158734-0
Great Russian Encyclopedia Online ID	2346246
HSDB ID	552
Human Metabolome Database ID	HMDB0029201
ICSC ID	0847
InChI	InChI=1S/Hf
InChIKey	VBJZVLUMGGDVMO-UHFFFAOYSA-N
KBpedia ID	Hafnium
Library of Congress authority ID	sh85058238
MeSH descriptor ID	D006195
NALT ID	44295
NDL Authority ID	00562767
National Library of Israel J9U ID	987007545701705171
OmegaWiki Defined Meaning	159925
OpenAlex ID	C546638069
PSH ID	5762
PubChem CID	23986
Quora topic ID	Hafnium
RxNorm ID	1534767
Store norske leksikon ID	hafnium
Treccani ID	afnio
UK Parliament thesaurus ID	509495
UNII	X71938L1DO
WordNet 3.1 Synset ID	14663734-n
ZVG number	7720
Zhihu topic ID	20042597

Hafnium (Hf)

Properties

Isotopes of Hafnium

153Hf

153Hf Decay Modes

154Hf

154Hf Decay Modes

155Hf

155Hf Decay Modes

156Hf

156Hf Decay Modes

157Hf

157Hf Decay Modes

158Hf

158Hf Decay Modes

159Hf

159Hf Decay Modes

160Hf

160Hf Decay Modes

161Hf

161Hf Decay Modes

162Hf

162Hf Decay Modes

163Hf

163Hf Decay Modes

164Hf

164Hf Decay Modes

165Hf

165Hf Decay Modes

166Hf

166Hf Decay Modes

167Hf

167Hf Decay Modes

168Hf

168Hf Decay Modes

169Hf

169Hf Decay Modes

170Hf

170Hf Decay Modes

171Hf

171Hf Decay Modes

172Hf

172Hf Decay Modes

173Hf

173Hf Decay Modes

174Hf

174Hf Decay Modes

175Hf

175Hf Decay Modes

176Hf

177Hf

178Hf

179Hf

180Hf

181Hf

181Hf Decay Modes

182Hf

182Hf Decay Modes

183Hf

183Hf Decay Modes

184Hf

184Hf Decay Modes

185Hf

185Hf Decay Modes

186Hf

186Hf Decay Modes

187Hf

187Hf Decay Modes

188Hf

188Hf Decay Modes

189Hf

189Hf Decay Modes

190Hf

190Hf Decay Modes