Periodic Table Element Comparison: Compare Elements - Zirconium vs Hafnium
Compare Zirconium and Hafnium on the basis of their properties, attributes and periodic table facts. Compare elements on more than 90 properties. All the elements of similar categories show a lot of similarities and differences in their chemical, atomic, physical properties and uses. These similarities and dissimilarities should be known while we study periodic table elements. You can study the detailed comparison between Zirconium vs Hafnium with most reliable information about their properties, attributes, facts, uses etc. You can compare Zr vs Hf on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more. Zirconium and Hafnium comparison table on more than 90 properties.
Zirconium and Hafnium Comparison
Facts
| Name | Zirconium | Hafnium |
|---|---|---|
| Atomic Number | 40 | 72 |
| Atomic Symbol | Zr | Hf |
| Atomic Weight | 91.224 | 178.49 |
| Phase at STP | Solid | Solid |
| Color | Silver | Gray |
| Metallic Classification | Transition Metal | Transition Metal |
| Group in Periodic Table | group 4 | group 4 |
| Group Name | titanium family | titanium family |
| Period in Periodic Table | period 5 | period 6 |
| Block in Periodic Table | d -block | d -block |
| Electronic Configuration | [Kr] 4d2 5s2 | [Xe] 4f14 5d2 6s2 |
| Electronic Shell Structure (Electrons per shell) | 2, 8, 18, 10, 2 | 2, 8, 18, 32, 10, 2 |
| Melting Point | 2128 K | 2506 K |
| Boiling Point | 4682 K | 4876 K |
| CAS Number | CAS7440-67-7 | CAS7440-58-6 |
| Neighborhood Elements | Neighborhood Elements of Zirconium | Neighborhood Elements of Hafnium |
History
| Parameter | Zirconium | Hafnium |
|---|---|---|
| History | The element Zirconium was discovered by H. Klaproth in year 1789 in Germany. Zirconium derived its name from Persian Zargun, 'gold-colored'; German Zirkoon, 'jargoon'. | The element Hafnium was discovered by D. Coster and G. von Hevesy in year 1922 in Denmark. Hafnium derived its name from Hafnia, the New Latin name for Copenhagen. |
| Discovery | H. Klaproth (1789) | D. Coster and G. von Hevesy (1922) |
| Isolated | J. Berzelius (1824) | D. Coster and G. von Hevesy (1922) |
Presence: Abundance in Nature and Around Us
Parts per billion (ppb) by weight / by atoms (1ppb =10^-7 %)
| Property | Zirconium | Hafnium |
|---|---|---|
| Abundance in Universe | 50 / 0.7 | 0.7 / 0.005 |
| Abundance in Sun | 40 / 0.5 | 1 / 0.01 |
| Abundance in Meteorites | 6700 / 1600 | 170 / 20 |
| Abundance in Earth's Crust | 130000 / 30000 | 3300 / 380 |
| Abundance in Oceans | 0.026 / 0.0018 | 0.008 / 0.00028 |
| Abundance in Humans | 50 / 3 | - / - |
Crystal Structure and Atomic Structure
| Property | Zirconium | Hafnium |
|---|---|---|
| Atomic Volume | 14.011 cm3/mol | 13.44 cm3/mol |
| Atomic Radius | 206 pm | 208 pm |
| Covalent Radius | 148 pm | 150 pm |
| Van der Waals Radius | - | - |
Atomic Spectrum - Spectral Lines | ||
| Emission Spectrum |  |  |
| Absorption Spectrum |  |  |
| Lattice Constant | 323.2, 323.2, 514.7 pm | 319.64, 319.64, 505.11 pm |
| Lattice Angle | π/2, π/2, 2 π/3 | π/2, π/2, 2 π/3 |
| Space Group Name | P63/mmc | P63/mmc |
| Space Group Number | 194 | 194 |
| Crystal Structure | Simple Hexagonal  | Simple Hexagonal |
Atomic and Orbital Properties
| Property | Zirconium | Hafnium |
|---|---|---|
| Atomic Number | 40 | 72 |
| Number of Electrons (with no charge) | 40 | 72 |
| Number of Protons | 40 | 72 |
| Mass Number | 91.224 | 178.49 |
| Number of Neutrons | 51 | 106 |
| Shell structure (Electrons per energy level) | 2, 8, 18, 10, 2 | 2, 8, 18, 32, 10, 2 |
| Electron Configuration | [Kr] 4d2 5s2 | [Xe] 4f14 5d2 6s2 |
| Valence Electrons | 4d2 5s2 | 5d2 6s2 |
| Oxidation State | 4 | 4 |
| Atomic Term Symbol (Quantum Numbers) | 3F2 | 3F2 |
| Shell structure |  |  |
Isotopes and Nuclear Properties
Zirconium has 4 stable naturally occuring isotopes while Hafnium has 5 stable naturally occuring isotopes.
| Parameter | Zirconium | Hafnium |
|---|---|---|
| Known Isotopes | 78Zr, 79Zr, 80Zr, 81Zr, 82Zr, 83Zr, 84Zr, 85Zr, 86Zr, 87Zr, 88Zr, 89Zr, 90Zr, 91Zr, 92Zr, 93Zr, 94Zr, 95Zr, 96Zr, 97Zr, 98Zr, 99Zr, 100Zr, 101Zr, 102Zr, 103Zr, 104Zr, 105Zr, 106Zr, 107Zr, 108Zr, 109Zr, 110Zr | 153Hf, 154Hf, 155Hf, 156Hf, 157Hf, 158Hf, 159Hf, 160Hf, 161Hf, 162Hf, 163Hf, 164Hf, 165Hf, 166Hf, 167Hf, 168Hf, 169Hf, 170Hf, 171Hf, 172Hf, 173Hf, 174Hf, 175Hf, 176Hf, 177Hf, 178Hf, 179Hf, 180Hf, 181Hf, 182Hf, 183Hf, 184Hf, 185Hf, 186Hf, 187Hf, 188Hf |
| Stable Isotopes | Naturally occurring stable isotopes: 90Zr, 91Zr, 92Zr, 94Zr | Naturally occurring stable isotopes: 176Hf, 177Hf, 178Hf, 179Hf, 180Hf |
| Neutron Cross Section | 0.184 | 104 |
| Neutron Mass Absorption | 0.00066 | 0.02 |
Chemical Properties: Ionization Energies and electron affinity
| Property | Zirconium | Hafnium |
|---|---|---|
| Valence or Valency | 4 | 4 |
| Electronegativity | 1.33 Pauling Scale | 1.3 Pauling Scale |
| Electron Affinity | 41.1 kJ/mol | 0 kJ/mol |
| Ionization Energies | 1st: 640.1 kJ/mol 2nd: 1270 kJ/mol 3rd: 2218 kJ/mol 4th: 3313 kJ/mol 5th: 7752 kJ/mol 6th: 9500 kJ/mol | 1st: 658.5 kJ/mol 2nd: 1440 kJ/mol 3rd: 2250 kJ/mol 4th: 3216 kJ/mol |
Physical Properties
| Property | Zirconium | Hafnium |
|---|---|---|
| Density | 6.511 g/cm3 | 13.31 g/cm3 |
| Molar Volume | 14.011 cm3/mol | 13.44 cm3/mol |
Elastic Properties | ||
| Young Modulus | 68 | 78 |
| Shear Modulus | 33 GPa | 30 GPa |
| Bulk Modulus | - | 110 GPa |
| Poisson Ratio | 0.34 | 0.37 |
Hardness - Tests to Measure of Hardness of Element | ||
| Mohs Hardness | 5 MPa | 5.5 MPa |
| Vickers Hardness | 903 MPa | 1760 MPa |
| Brinell Hardness | 650 MPa | 1700 MPa |
Electrical Properties | ||
| Electrical Conductivity | 2400000 S/m | 3300000 S/m |
| Resistivity | 4.2e-7 m Ω | 3e-7 m Ω |
| Superconducting Point | 0.61 | 0.128 |
Heat and Conduction Properties | ||
| Thermal Conductivity | 23 W/(m K) | 23 W/(m K) |
| Thermal Expansion | 0.0000057 /K | 0.0000059 /K |
Magnetic Properties | ||
| Magnetic Type | Paramagnetic | Paramagnetic |
| Curie Point | - | - |
| Mass Magnetic Susceptibility | 1.68e-8 m3/kg | 5.3e-9 m3/kg |
| Molar Magnetic Susceptibility | 1.53e-9 m3/mol | 9.46e-10 m3/mol |
| Volume Magnetic Susceptibility | 0.000109 | 0.0000705 |
Optical Properties | ||
| Refractive Index | - | - |
Acoustic Properties | ||
| Speed of Sound | 3800 m/s | 3010 m/s |
Thermal Properties - Enthalpies and thermodynamics
| Property | Zirconium | Hafnium |
|---|---|---|
| Melting Point | 2128 K | 2506 K |
| Boiling Point | 4682 K | 4876 K |
| Critical Temperature | - | - |
| Superconducting Point | 0.61 | 0.128 |
Enthalpies | ||
| Heat of Fusion | 21 kJ/mol | 25.5 kJ/mol |
| Heat of Vaporization | 580 kJ/mol | 630 kJ/mol |
| Heat of Combustion | - | - |
Regulatory and Health - Health and Safety Parameters and Guidelines
| Parameter | Zirconium | Hafnium |
|---|---|---|
| CAS Number | CAS7440-67-7 | CAS7440-58-6 |
| RTECS Number | - | RTECSMG4600000 |
| DOT Hazard Class | 4.2 | 4.2 |
| DOT Numbers | 2008 | 2545 |
| EU Number | - | - |
| NFPA Fire Rating | 1 | - |
| NFPA Health Rating | 1 | - |
| NFPA Reactivity Rating | 0 | - |
| NFPA Hazards | - | - |
| AutoIgnition Point | - | - |
| Flashpoint | - | - |
Compare With Other Elements
Compare Zirconium and Hafnium with other elements of the periodic table.