Periodic Table Element Comparison: Compare Elements - Americium vs Mendelevium
Compare Americium and Mendelevium 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 Americium vs Mendelevium with most reliable information about their properties, attributes, facts, uses etc. You can compare Am vs Md on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more. Americium and Mendelevium comparison table on more than 90 properties.
Americium and Mendelevium Comparison
Facts
| Name | Americium | Mendelevium |
|---|---|---|
| Atomic Number | 95 | 101 |
| Atomic Symbol | Am | Md |
| Atomic Weight | 243 | 258 |
| Phase at STP | Solid | Solid |
| Color | Silver | - |
| Metallic Classification | Actinide | Actinide |
| Group in Periodic Table | group - | group - |
| Group Name | ||
| Period in Periodic Table | period 7 | period 7 |
| Block in Periodic Table | f -block | f -block |
| Electronic Configuration | [Rn] 5f7 7s2 | [Rn] 5f13 7s2 |
| Electronic Shell Structure (Electrons per shell) | 2, 8, 18, 32, 25, 8, 2 | 2, 8, 18, 32, 31, 8, 2 |
| Melting Point | 1449 K | 1100 K |
| Boiling Point | 2284 K | - |
| CAS Number | CAS7440-35-9 | CAS7440-11-1 |
| Neighborhood Elements | Neighborhood Elements of Americium | Neighborhood Elements of Mendelevium |
History
| Parameter | Americium | Mendelevium |
|---|---|---|
| History | 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. | The element Mendelevium was discovered by A. Ghiorso,G. Harvey,R. Choppin, S. G. Thompson and G. T. Seaborg in year 1955 in United States. Mendelevium derived its name from Dmitri Mendeleev, chemist and inventor. |
| Discovery | G. T. Seaborg,R. A. James,O. Morgan and A. Ghiorso (1944) | A. Ghiorso,G. Harvey,R. Choppin, S. G. Thompson and G. T. Seaborg (1955) |
| Isolated | () | () |
Presence: Abundance in Nature and Around Us
Parts per billion (ppb) by weight / by atoms (1ppb =10^-7 %)
| Property | Americium | Mendelevium |
|---|---|---|
| Abundance in Universe | - / - | - / - |
| Abundance in Sun | - / - | - / - |
| Abundance in Meteorites | - / - | - / - |
| Abundance in Earth's Crust | - / - | - / - |
| Abundance in Oceans | - / - | - / - |
| Abundance in Humans | - / - | - / - |
Crystal Structure and Atomic Structure
| Property | Americium | Mendelevium |
|---|---|---|
| Atomic Volume | 17.63 cm3/mol | - |
| Atomic Radius | 175 pm | - |
| Covalent Radius | - | - |
| Van der Waals Radius | - | - |
Atomic Spectrum - Spectral Lines | ||
| Emission Spectrum |  | Not available |
| Absorption Spectrum |  | Not available |
| Lattice Constant | 346.81, 346.81, 1124.1 pm | - |
| Lattice Angle | π/2, π/2, 2 π/3 | - |
| Space Group Name | P63/mmc | - |
| Space Group Number | 194 | - |
| Crystal Structure | Simple Hexagonal  | Face Centered Cubic  |
Atomic and Orbital Properties
| Property | Americium | Mendelevium |
|---|---|---|
| Atomic Number | 95 | 101 |
| Number of Electrons (with no charge) | 95 | 101 |
| Number of Protons | 95 | 101 |
| Mass Number | 243 | 258 |
| Number of Neutrons | 148 | 157 |
| Shell structure (Electrons per energy level) | 2, 8, 18, 32, 25, 8, 2 | 2, 8, 18, 32, 31, 8, 2 |
| Electron Configuration | [Rn] 5f7 7s2 | [Rn] 5f13 7s2 |
| Valence Electrons | 5f7 7s2 | 5f13 7s2 |
| Oxidation State | 3 | 3 |
| Atomic Term Symbol (Quantum Numbers) | 8S7/2 | 2F7/2 |
| Shell structure |  |  |
Isotopes and Nuclear Properties
Americium has 0 stable naturally occuring isotopes while Mendelevium has 0 stable naturally occuring isotopes.
| Parameter | Americium | Mendelevium |
|---|---|---|
| Known Isotopes | 231Am, 232Am, 233Am, 234Am, 235Am, 236Am, 237Am, 238Am, 239Am, 240Am, 241Am, 242Am, 243Am, 244Am, 245Am, 246Am, 247Am, 248Am, 249Am | 245Md, 246Md, 247Md, 248Md, 249Md, 250Md, 251Md, 252Md, 253Md, 254Md, 255Md, 256Md, 257Md, 258Md, 259Md, 260Md, 261Md, 262Md |
| Stable Isotopes | - | |
| Neutron Cross Section | 74 | - |
| Neutron Mass Absorption | - | - |
Chemical Properties: Ionization Energies and electron affinity
| Property | Americium | Mendelevium |
|---|---|---|
| Valence or Valency | 4 | 3 |
| Electronegativity | 1.13 Pauling Scale | 1.3 Pauling Scale |
| Electron Affinity | - | - |
| Ionization Energies | 1st: 578 kJ/mol | 1st: 635 kJ/mol |
Physical Properties
| Property | Americium | Mendelevium |
|---|---|---|
| Density | 13.67 g/cm3 | - |
| Molar Volume | 17.63 cm3/mol | - |
Elastic Properties | ||
| Young Modulus | - | - |
| Shear Modulus | - | - |
| Bulk Modulus | - | - |
| Poisson Ratio | - | - |
Hardness - Tests to Measure of Hardness of Element | ||
| Mohs Hardness | - | - |
| Vickers Hardness | - | - |
| Brinell Hardness | - | - |
Electrical Properties | ||
| Electrical Conductivity | - | - |
| Resistivity | - | - |
| Superconducting Point | 0.6 | - |
Heat and Conduction Properties | ||
| Thermal Conductivity | 10 W/(m K) | - |
| Thermal Expansion | - | - |
Magnetic Properties | ||
| Magnetic Type | Paramagnetic | - |
| Curie Point | - | - |
| Mass Magnetic Susceptibility | 5.15e-8 m3/kg | - |
| Molar Magnetic Susceptibility | 1.251e-8 m3/mol | - |
| Volume Magnetic Susceptibility | 0.000704 | - |
Optical Properties | ||
| Refractive Index | - | - |
Acoustic Properties | ||
| Speed of Sound | - | - |
Thermal Properties - Enthalpies and thermodynamics
| Property | Americium | Mendelevium |
|---|---|---|
| Melting Point | 1449 K | 1100 K |
| Boiling Point | 2284 K | - |
| Critical Temperature | - | - |
| Superconducting Point | 0.6 | - |
Enthalpies | ||
| Heat of Fusion | - | - |
| Heat of Vaporization | - | - |
| Heat of Combustion | - | - |
Regulatory and Health - Health and Safety Parameters and Guidelines
| Parameter | Americium | Mendelevium |
|---|---|---|
| CAS Number | CAS7440-35-9 | CAS7440-11-1 |
| RTECS Number | - | - |
| DOT Hazard Class | - | - |
| DOT Numbers | - | - |
| EU Number | - | - |
| NFPA Fire Rating | - | - |
| NFPA Health Rating | - | - |
| NFPA Reactivity Rating | - | - |
| NFPA Hazards | - | - |
| AutoIgnition Point | - | - |
| Flashpoint | - | - |
Compare With Other Elements
Compare Americium and Mendelevium with other elements of the periodic table.