Compare Actinium vs Erbium: Periodic Table Element Comparison Table and Properties
Compare the elements Actinium and Erbium on the basis of their properties, attributes and periodic table facts. Compare elements - Actinium and Erbium comparison table side by side across over 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 Actinium vs Erbium with most reliable information about their properties, attributes, facts, uses etc. You can compare Ac vs Er on more than 90 properties like electronegativity, oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more. This in-depth comparison helps students, educators, researchers, and science enthusiasts understand the differences and similarities between Actinium and Erbium.
Actinium and Erbium Comparison
Here's a detailed comparison between Actinium (Ac) and Erbium (Er), focusing on their position in the periodic table, physical and chemical properties, stability, and uses.
Facts - Basic Element Details
| Name | Actinium | Erbium |
|---|---|---|
| Atomic Number | 89 | 68 |
| Atomic Symbol | Ac | Er |
| Atomic Weight | 227 | 167.259 |
| Phase at STP | Solid | Solid |
| Color | Silver | Silver |
| Metallic Classification | Actinide | Lanthanide |
| Group in Periodic Table | Actinide (no group number) | Lanthanide (no group number) |
| Group Name | ||
| Period in Periodic Table | period 7 | period 6 |
| Block in Periodic Table | f -block | f -block |
| Electronic Configuration | [Rn] 6d1 7s2 | [Xe] 4f12 6s2 |
| Electronic Shell Structure (Electrons per shell) | 2, 8, 18, 32, 18, 9, 2 | 2, 8, 18, 30, 8, 2 |
| Melting Point | 1323 K | 1770 K |
| Boiling Point | 3473 K | 3141 K |
| CAS Number | CAS7440-34-8 | CAS7440-52-0 |
| Neighborhood Elements | Neighborhood Elements of Actinium | Neighborhood Elements of Erbium |
History
| Parameter | Actinium | Erbium |
|---|---|---|
| History | The element Actinium was discovered by F. O. Giesel in year 1902 in France. Actinium derived its name from the Greek aktis, 'ray'. | The element Erbium was discovered by G. Mosander in year 1842 in Sweden. Erbium derived its name from Ytterby, Sweden. |
| Discovery | F. O. Giesel (1902) | G. Mosander (1842) |
| Isolated | F. O. Giesel (1902) | T. Cleve (1879) |
Presence: Abundance in Nature and Around Us
Parts per billion (ppb) by weight / by atoms (1ppb =10^-7 %)
| Property | Actinium | Erbium |
|---|---|---|
| Abundance in Universe | / | 2 / 0.01 |
| Abundance in Sun | / | 1 / 0.01 |
| Abundance in Meteorites | / | 180 / 20 |
| Abundance in Earth's Crust | / | 3000 / 370 |
| Abundance in Oceans | / | 0.0009 / 0.000033 |
| Abundance in Humans | / | - / - |
Crystal Structure and Atomic Structure
| Property | Actinium | Erbium |
|---|---|---|
| Atomic Volume | 22.5422 cm3/mol | 18.449 cm3/mol |
| Atomic Radius | 195 pm | 226 pm |
| Covalent Radius | - | - |
| Van der Waals Radius | - | - |
Atomic Spectrum - Spectral Lines | ||
| Emission Spectrum |  |  |
| Absorption Spectrum |  |  |
| Lattice Constant | 567, 567, 567 pm | 355.88, 355.88, 558.74 pm |
| Lattice Angle | π/2, π/2, π/2 | π/2, π/2, 2 π/3 |
| Space Group Name | Fm_ 3m | P63/mmc |
| Space Group Number | 225 | 194 |
| Crystal Structure | Face Centered Cubic  | Simple Hexagonal  |
Atomic and Orbital Properties
| Property | Actinium | Erbium |
|---|---|---|
| Atomic Number | 89 | 68 |
| Number of Electrons (with no charge) | 89 | 68 |
| Number of Protons | 89 | 68 |
| Mass Number | 227 | 167.259 |
| Number of Neutrons | 138 | 99 |
| Shell structure (Electrons per energy level) | 2, 8, 18, 32, 18, 9, 2 | 2, 8, 18, 30, 8, 2 |
| Electron Configuration | [Rn] 6d1 7s2 | [Xe] 4f12 6s2 |
| Valence Electrons | 6d1 7s2 | 4f12 6s2 |
| Oxidation State | 3 | 3 |
| Atomic Term Symbol (Quantum Numbers) | 2D3/2 | 3H6 |
| Shell structure |  |  |
Isotopes and Nuclear Properties
Actinium has 0 stable naturally occuring isotopes while Erbium has 6 stable naturally occuring isotopes.
| Parameter | Actinium | Erbium |
|---|---|---|
| Known Isotopes | 206Ac, 207Ac, 208Ac, 209Ac, 210Ac, 211Ac, 212Ac, 213Ac, 214Ac, 215Ac, 216Ac, 217Ac, 218Ac, 219Ac, 220Ac, 221Ac, 222Ac, 223Ac, 224Ac, 225Ac, 226Ac, 227Ac, 228Ac, 229Ac, 230Ac, 231Ac, 232Ac, 233Ac, 234Ac, 235Ac, 236Ac | 143Er, 144Er, 145Er, 146Er, 147Er, 148Er, 149Er, 150Er, 151Er, 152Er, 153Er, 154Er, 155Er, 156Er, 157Er, 158Er, 159Er, 160Er, 161Er, 162Er, 163Er, 164Er, 165Er, 166Er, 167Er, 168Er, 169Er, 170Er, 171Er, 172Er, 173Er, 174Er, 175Er, 176Er, 177Er |
| Stable Isotopes | - | Naturally occurring stable isotopes: 162Er, 164Er, 166Er, 167Er, 168Er, 170Er |
| Neutron Cross Section | 810 | 165 |
| Neutron Mass Absorption | 0.079 | 0.036 |
Chemical Properties: Ionization Energies and electron affinity
| Property | Actinium | Erbium |
|---|---|---|
| Valence or Valency | 3 | 3 |
| Electronegativity | 1.1 Pauling Scale | 1.24 Pauling Scale |
| Oxidation State | 3 | 3 |
| Electron Affinity | - | 50 kJ/mol |
| Ionization Energies | 1st: 499 kJ/mol 2nd: 1170 kJ/mol | 1st: 589.3 kJ/mol 2nd: 1150 kJ/mol 3rd: 2194 kJ/mol 4th: 4120 kJ/mol |
Physical Properties
Erbium (9.066 g/cm³) is less dense than Actinium (10.07 g/cm³). This means that a given volume of Actinium will be heavier than the same volume of Erbium. Actinium is about 11.1 denser than Erbium
| Property | Actinium | Erbium |
|---|---|---|
| Phase at STP | Solid | Solid |
| Color | Silver | Silver |
| Density | 10.07 g/cm3 | 9.066 g/cm3 |
| Density (when liquid (at melting point)) | - | 8.86 g/cm3 |
| Molar Volume | 22.5422 cm3/mol | 18.449 cm3/mol |
Mechanical and Hardness Properties
| Property | Actinium | Erbium |
|---|---|---|
Elastic Properties | ||
| Young Modulus | - | 70 |
| Shear Modulus | - | 28 GPa |
| Bulk Modulus | - | 44 GPa |
| Poisson Ratio | - | 0.24 |
Hardness - Tests to Measure of Hardness of Element | ||
| Mohs Hardness | - | - |
| Vickers Hardness | - | 589 MPa |
| Brinell Hardness | - | 814 MPa |
Thermal and Electrical Conductivity
| Property | Actinium | Erbium |
|---|---|---|
Heat and Conduction Properties | ||
| Thermal Conductivity | 12 W/(m K) | 15 W/(m K) |
| Thermal Expansion | - | 0.0000122 /K |
Electrical Properties | ||
| Electrical Conductivity | - | 1200000 S/m |
| Resistivity | - | 8.59e-7 m Ω |
| Superconducting Point | - | - |
Magnetic and Optical Properties
| Property | Actinium | Erbium |
|---|---|---|
Magnetic Properties | ||
| Magnetic Type | - | Paramagnetic |
| Curie Point | - | 32 K |
| Mass Magnetic Susceptibility | - | 0.00000377 m3/kg |
| Molar Magnetic Susceptibility | - | 6.30566e-7 m3/mol |
| Volume Magnetic Susceptibility | - | 0.0341788 |
Optical Properties | ||
| Refractive Index | - | - |
Acoustic Properties | ||
| Speed of Sound | - | 2830 m/s |
Thermal Properties - Enthalpies and thermodynamics
| Property | Actinium | Erbium |
|---|---|---|
| Melting Point | 1323 K | 1770 K |
| Boiling Point | 3473 K | 3141 K |
| Critical Temperature | - | - |
| Superconducting Point | - | - |
Enthalpies | ||
| Heat of Fusion | 14 kJ/mol | 19.9 kJ/mol |
| Heat of Vaporization | 400 kJ/mol | 285 kJ/mol |
| Heat of Combustion | - | - |
Regulatory and Health - Health and Safety Parameters and Guidelines
| Parameter | Actinium | Erbium |
|---|---|---|
| CAS Number | CAS7440-34-8 | CAS7440-52-0 |
| RTECS Number | - | - |
| DOT Hazard Class | - | - |
| DOT Numbers | - | - |
| EU Number | - | - |
| NFPA Fire Rating | - | - |
| NFPA Health Rating | - | - |
| NFPA Reactivity Rating | - | - |
| NFPA Hazards | - | - |
| AutoIgnition Point | - | - |
| Flashpoint | - | - |
Compare Actinium and Erbium With Other Elements
Compare Actinium and Erbium with other elements of the periodic table. Explore howActinium and Erbium stack up against other elements of the periodic table. Use our interactive comparison tool to analyze 90+ properties across different metals, non-metals, metalloids, and noble gases. Understanding these differences is crucial for applications in engineering, chemistry, electronics, biology, and material science.