Periodic Table Element Comparison: Compare Elements - Hafnium vs Americium
Compare Hafnium and Americium 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 Hafnium vs Americium with most reliable information about their properties, attributes, facts, uses etc. You can compare Hf vs Am on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more. Hafnium and Americium comparison table on more than 90 properties.
Hafnium and Americium Comparison
Facts
| Name | Hafnium | Americium |
|---|---|---|
| Atomic Number | 72 | 95 |
| Atomic Symbol | Hf | Am |
| Atomic Weight | 178.49 | 243 |
| Phase at STP | Solid | Solid |
| Color | Gray | Silver |
| Metallic Classification | Transition Metal | Actinide |
| Group in Periodic Table | group 4 | group - |
| Group Name | titanium family | |
| Period in Periodic Table | period 6 | period 7 |
| Block in Periodic Table | d -block | f -block |
| Electronic Configuration | [Xe] 4f14 5d2 6s2 | [Rn] 5f7 7s2 |
| Electronic Shell Structure (Electrons per shell) | 2, 8, 18, 32, 10, 2 | 2, 8, 18, 32, 25, 8, 2 |
| Melting Point | 2506 K | 1449 K |
| Boiling Point | 4876 K | 2284 K |
| CAS Number | CAS7440-58-6 | CAS7440-35-9 |
| Neighborhood Elements | Neighborhood Elements of Hafnium | Neighborhood Elements of Americium |
History
| Parameter | Hafnium | Americium |
|---|---|---|
| History | 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. | The element Americium was discovered by G. T. Seaborg,R. A. James,O. Morgan and A. Ghiorso in year 1944 in United States. Americium derived its name from The Americas, as the element was first synthesized on the continent, by analogy with europium. |
| Discovery | D. Coster and G. von Hevesy (1922) | G. T. Seaborg,R. A. James,O. Morgan and A. Ghiorso (1944) |
| Isolated | 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 | Hafnium | Americium |
|---|---|---|
| Abundance in Universe | 0.7 / 0.005 | - / - |
| Abundance in Sun | 1 / 0.01 | - / - |
| Abundance in Meteorites | 170 / 20 | - / - |
| Abundance in Earth's Crust | 3300 / 380 | - / - |
| Abundance in Oceans | 0.008 / 0.00028 | - / - |
| Abundance in Humans | - / - | - / - |
Crystal Structure and Atomic Structure
| Property | Hafnium | Americium |
|---|---|---|
| Atomic Volume | 13.44 cm3/mol | 17.63 cm3/mol |
| Atomic Radius | 208 pm | 175 pm |
| Covalent Radius | 150 pm | - |
| Van der Waals Radius | - | - |
Atomic Spectrum - Spectral Lines | ||
| Emission Spectrum |  |  |
| Absorption Spectrum |  |  |
| Lattice Constant | 319.64, 319.64, 505.11 pm | 346.81, 346.81, 1124.1 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 | Hafnium | Americium |
|---|---|---|
| Atomic Number | 72 | 95 |
| Number of Electrons (with no charge) | 72 | 95 |
| Number of Protons | 72 | 95 |
| Mass Number | 178.49 | 243 |
| Number of Neutrons | 106 | 148 |
| Shell structure (Electrons per energy level) | 2, 8, 18, 32, 10, 2 | 2, 8, 18, 32, 25, 8, 2 |
| Electron Configuration | [Xe] 4f14 5d2 6s2 | [Rn] 5f7 7s2 |
| Valence Electrons | 5d2 6s2 | 5f7 7s2 |
| Oxidation State | 4 | 3 |
| Atomic Term Symbol (Quantum Numbers) | 3F2 | 8S7/2 |
| Shell structure |  |  |
Isotopes and Nuclear Properties
Hafnium has 5 stable naturally occuring isotopes while Americium has 0 stable naturally occuring isotopes.
| Parameter | Hafnium | Americium |
|---|---|---|
| Known Isotopes | 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 | 231Am, 232Am, 233Am, 234Am, 235Am, 236Am, 237Am, 238Am, 239Am, 240Am, 241Am, 242Am, 243Am, 244Am, 245Am, 246Am, 247Am, 248Am, 249Am |
| Stable Isotopes | Naturally occurring stable isotopes: 176Hf, 177Hf, 178Hf, 179Hf, 180Hf | |
| Neutron Cross Section | 104 | 74 |
| Neutron Mass Absorption | 0.02 | - |
Chemical Properties: Ionization Energies and electron affinity
| Property | Hafnium | Americium |
|---|---|---|
| Valence or Valency | 4 | 4 |
| Electronegativity | 1.3 Pauling Scale | 1.13 Pauling Scale |
| Electron Affinity | 0 kJ/mol | - |
| Ionization Energies | 1st: 658.5 kJ/mol 2nd: 1440 kJ/mol 3rd: 2250 kJ/mol 4th: 3216 kJ/mol | 1st: 578 kJ/mol |
Physical Properties
| Property | Hafnium | Americium |
|---|---|---|
| Density | 13.31 g/cm3 | 13.67 g/cm3 |
| Molar Volume | 13.44 cm3/mol | 17.63 cm3/mol |
Elastic Properties | ||
| Young Modulus | 78 | - |
| Shear Modulus | 30 GPa | - |
| Bulk Modulus | 110 GPa | - |
| Poisson Ratio | 0.37 | - |
Hardness - Tests to Measure of Hardness of Element | ||
| Mohs Hardness | 5.5 MPa | - |
| Vickers Hardness | 1760 MPa | - |
| Brinell Hardness | 1700 MPa | - |
Electrical Properties | ||
| Electrical Conductivity | 3300000 S/m | - |
| Resistivity | 3e-7 m Ω | - |
| Superconducting Point | 0.128 | 0.6 |
Heat and Conduction Properties | ||
| Thermal Conductivity | 23 W/(m K) | 10 W/(m K) |
| Thermal Expansion | 0.0000059 /K | - |
Magnetic Properties | ||
| Magnetic Type | Paramagnetic | Paramagnetic |
| Curie Point | - | - |
| Mass Magnetic Susceptibility | 5.3e-9 m3/kg | 5.15e-8 m3/kg |
| Molar Magnetic Susceptibility | 9.46e-10 m3/mol | 1.251e-8 m3/mol |
| Volume Magnetic Susceptibility | 0.0000705 | 0.000704 |
Optical Properties | ||
| Refractive Index | - | - |
Acoustic Properties | ||
| Speed of Sound | 3010 m/s | - |
Thermal Properties - Enthalpies and thermodynamics
| Property | Hafnium | Americium |
|---|---|---|
| Melting Point | 2506 K | 1449 K |
| Boiling Point | 4876 K | 2284 K |
| Critical Temperature | - | - |
| Superconducting Point | 0.128 | 0.6 |
Enthalpies | ||
| Heat of Fusion | 25.5 kJ/mol | - |
| Heat of Vaporization | 630 kJ/mol | - |
| Heat of Combustion | - | - |
Regulatory and Health - Health and Safety Parameters and Guidelines
| Parameter | Hafnium | Americium |
|---|---|---|
| CAS Number | CAS7440-58-6 | CAS7440-35-9 |
| RTECS Number | RTECSMG4600000 | - |
| DOT Hazard Class | 4.2 | - |
| DOT Numbers | 2545 | - |
| EU Number | - | - |
| NFPA Fire Rating | - | - |
| NFPA Health Rating | - | - |
| NFPA Reactivity Rating | - | - |
| NFPA Hazards | - | - |
| AutoIgnition Point | - | - |
| Flashpoint | - | - |
Compare With Other Elements
Compare Hafnium and Americium with other elements of the periodic table.