Periodic Table Element Comparison: Compare Elements - Aluminium vs Silicon
Compare Aluminium and Silicon 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 Aluminium vs Silicon with most reliable information about their properties, attributes, facts, uses etc. You can compare Al vs Si on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more. Aluminium and Silicon comparison table on more than 90 properties.
Aluminium and Silicon Comparison
Facts
| Name | Aluminium | Silicon |
|---|---|---|
| Atomic Number | 13 | 14 |
| Atomic Symbol | Al | Si |
| Atomic Weight | 26.981538 | 28.0855 |
| Phase at STP | Solid | Solid |
| Color | Silver | Gray |
| Metallic Classification | Post Transition Metal | Metalloid |
| Group in Periodic Table | group 13 | group 14 |
| Group Name | boron family | carbon family |
| Period in Periodic Table | period 3 | period 3 |
| Block in Periodic Table | p -block | p -block |
| Electronic Configuration | [Ne] 3s2 3p1 | [Ne] 3s2 3p2 |
| Electronic Shell Structure (Electrons per shell) | 2, 8, 3 | 2, 8, 4 |
| Melting Point | 933.47 K | 1687 K |
| Boiling Point | 2792 K | 3173 K |
| CAS Number | CAS7429-90-5 | CAS7440-21-3 |
| Neighborhood Elements | Neighborhood Elements of Aluminium | Neighborhood Elements of Silicon |
History
| Parameter | Aluminium | Silicon |
|---|---|---|
| History | The element Aluminium was discovered by H.C.Ørsted in year 1825 in Denmark. Aluminium derived its name from alumina, a compound (originally aluminum). | The element Silicon was discovered by J. Berzelius in year 1823 in Sweden. Silicon derived its name from the Latin silex, 'flint' (originally silicium). |
| Discovery | H.C.Ørsted (1825) | J. Berzelius (1823) |
| Isolated | H.C.Ørsted (1825) | J. Berzelius (1823) |
Presence: Abundance in Nature and Around Us
Parts per billion (ppb) by weight / by atoms (1ppb =10^-7 %)
| Property | Aluminium | Silicon |
|---|---|---|
| Abundance in Universe | 50000 / 2000 | 700000 / 30000 |
| Abundance in Sun | 60000 / 3000 | 900000 / 40000 |
| Abundance in Meteorites | 9300000 / 6700000 | 140000000 / 100000000 |
| Abundance in Earth's Crust | 82000000 / 63000000 | 270000000 / 200000000 |
| Abundance in Oceans | 5 / 1.1 | 1000 / 220 |
| Abundance in Humans | 900 / 210 | 260000 / 58000 |
Crystal Structure and Atomic Structure
| Property | Aluminium | Silicon |
|---|---|---|
| Atomic Volume | 9.99 cm3/mol | 12.054 cm3/mol |
| Atomic Radius | 118 pm | 111 pm |
| Covalent Radius | 118 pm | 111 pm |
| Van der Waals Radius | 184 pm | 210 pm |
Atomic Spectrum - Spectral Lines | ||
| Emission Spectrum |  |  |
| Absorption Spectrum |  |  |
| Lattice Constant | 404.95, 404.95, 404.95 pm | 543.09, 543.09, 543.09 pm |
| Lattice Angle | π/2, π/2, π/2 | π/2, π/2, π/2 |
| Space Group Name | Fm_ 3m | Fd_ 3m |
| Space Group Number | 225 | 227 |
| Crystal Structure | Face Centered Cubic  | Tetrahedral Packing  |
Atomic and Orbital Properties
| Property | Aluminium | Silicon |
|---|---|---|
| Atomic Number | 13 | 14 |
| Number of Electrons (with no charge) | 13 | 14 |
| Number of Protons | 13 | 14 |
| Mass Number | 26.981538 | 28.0855 |
| Number of Neutrons | 14 | 14 |
| Shell structure (Electrons per energy level) | 2, 8, 3 | 2, 8, 4 |
| Electron Configuration | [Ne] 3s2 3p1 | [Ne] 3s2 3p2 |
| Valence Electrons | 3s2 3p1 | 3s2 3p2 |
| Oxidation State | 3 | -4, 4 |
| Atomic Term Symbol (Quantum Numbers) | 2P1/2 | 3P0 |
| Shell structure |  |  |
Isotopes and Nuclear Properties
Aluminium has 1 stable naturally occuring isotopes while Silicon has 3 stable naturally occuring isotopes.
| Parameter | Aluminium | Silicon |
|---|---|---|
| Known Isotopes | 21Al, 22Al, 23Al, 24Al, 25Al, 26Al, 27Al, 28Al, 29Al, 30Al, 31Al, 32Al, 33Al, 34Al, 35Al, 36Al, 37Al, 38Al, 39Al, 40Al, 41Al, 42Al | 22Si, 23Si, 24Si, 25Si, 26Si, 27Si, 28Si, 29Si, 30Si, 31Si, 32Si, 33Si, 34Si, 35Si, 36Si, 37Si, 38Si, 39Si, 40Si, 41Si, 42Si, 43Si, 44Si |
| Stable Isotopes | Naturally occurring stable isotopes: 27Al | Naturally occurring stable isotopes: 28Si, 29Si, 30Si |
| Neutron Cross Section | 0.233 | 171 |
| Neutron Mass Absorption | 0.03 | 0.0002 |
Chemical Properties: Ionization Energies and electron affinity
| Property | Aluminium | Silicon |
|---|---|---|
| Valence or Valency | 3 | 4 |
| Electronegativity | 1.61 Pauling Scale | 1.9 Pauling Scale |
| Electron Affinity | 42.5 kJ/mol | 133.6 kJ/mol |
| Ionization Energies | 1st: 577.5 kJ/mol 2nd: 1816.7 kJ/mol 3rd: 2744.8 kJ/mol 4th: 11577 kJ/mol 5th: 14842 kJ/mol 6th: 18379 kJ/mol 7th: 23326 kJ/mol 8th: 27465 kJ/mol 9th: 31853 kJ/mol 10th: 38473 kJ/mol 11th: 42647 kJ/mol 12th: 201266 kJ/mol 13th: 222316 kJ/mol | 1st: 786.5 kJ/mol 2nd: 1577.1 kJ/mol 3rd: 3231.6 kJ/mol 4th: 4355.5 kJ/mol 5th: 16091 kJ/mol 6th: 19805 kJ/mol 7th: 23780 kJ/mol 8th: 29287 kJ/mol 9th: 33878 kJ/mol 10th: 38726 kJ/mol 11th: 45962 kJ/mol 12th: 50502 kJ/mol 13th: 235196 kJ/mol 14th: 257923 kJ/mol |
Physical Properties
| Property | Aluminium | Silicon |
|---|---|---|
| Density | 2.7 g/cm3 | 2.33 g/cm3 |
| Molar Volume | 9.99 cm3/mol | 12.054 cm3/mol |
Elastic Properties | ||
| Young Modulus | 70 | 47 |
| Shear Modulus | 26 GPa | - |
| Bulk Modulus | 76 GPa | 100 GPa |
| Poisson Ratio | 0.35 | - |
Hardness - Tests to Measure of Hardness of Element | ||
| Mohs Hardness | 2.75 MPa | 6.5 MPa |
| Vickers Hardness | 167 MPa | - |
| Brinell Hardness | 245 MPa | - |
Electrical Properties | ||
| Electrical Conductivity | 38000000 S/m | 1000 S/m |
| Resistivity | 2.6e-8 m Ω | 0.001 m Ω |
| Superconducting Point | 1.175 | - |
Heat and Conduction Properties | ||
| Thermal Conductivity | 235 W/(m K) | 150 W/(m K) |
| Thermal Expansion | 0.0000231 /K | 0.0000026 /K |
Magnetic Properties | ||
| Magnetic Type | Paramagnetic | Diamagnetic |
| Curie Point | - | - |
| Mass Magnetic Susceptibility | 7.8e-9 m3/kg | -1.6e-9 m3/kg |
| Molar Magnetic Susceptibility | 2.1e-10 m3/mol | -4.49e-11 m3/mol |
| Volume Magnetic Susceptibility | 0.0000211 | -0.00000373 |
Optical Properties | ||
| Refractive Index | - | - |
Acoustic Properties | ||
| Speed of Sound | 5100 m/s | 2200 m/s |
Thermal Properties - Enthalpies and thermodynamics
| Property | Aluminium | Silicon |
|---|---|---|
| Melting Point | 933.47 K | 1687 K |
| Boiling Point | 2792 K | 3173 K |
| Critical Temperature | - | - |
| Superconducting Point | 1.175 | - |
Enthalpies | ||
| Heat of Fusion | 10.7 kJ/mol | 50.2 kJ/mol |
| Heat of Vaporization | 293 kJ/mol | 359 kJ/mol |
| Heat of Combustion | - | -9055 J/(kg K) |
Regulatory and Health - Health and Safety Parameters and Guidelines
| Parameter | Aluminium | Silicon |
|---|---|---|
| CAS Number | CAS7429-90-5 | CAS7440-21-3 |
| RTECS Number | RTECSBD0330000 | RTECSVW0400000 |
| DOT Hazard Class | 4.3 | 4.1 |
| DOT Numbers | 1396 | 1346 |
| EU Number | - | - |
| NFPA Fire Rating | 1 | 0 |
| NFPA Health Rating | 0 | 1 |
| NFPA Reactivity Rating | 1 | 0 |
| NFPA Hazards | - | - |
| AutoIgnition Point | 400 °C | 150 °C |
| Flashpoint | 645 °C | - |
Compare With Other Elements
Compare Aluminium and Silicon with other elements of the periodic table.
Compare Aluminium with all Group 13 elementsCompare Aluminium with BoronCompare Aluminium with GalliumCompare Aluminium with IndiumCompare Aluminium with ThalliumCompare Aluminium with Nihonium Compare Aluminium with all Period 3 elementsCompare Aluminium with SodiumCompare Aluminium with MagnesiumCompare Aluminium with SiliconCompare Aluminium with PhosphorusCompare Aluminium with SulfurCompare Aluminium with ChlorineCompare Aluminium with Argon Compare Aluminium with all Post Transition Metal elements | Compare Silicon with all Group 14 elementsSilicon vs Carbon ComparisonSilicon vs Germanium ComparisonSilicon vs Tin ComparisonSilicon vs Lead ComparisonSilicon vs Flerovium Comparison Compare Silicon with all Period 3 elementsSilicon vs Sodium ComparisonSilicon vs Magnesium ComparisonSilicon vs Aluminium ComparisonSilicon vs Phosphorus ComparisonSilicon vs Sulfur ComparisonSilicon vs Chlorine ComparisonSilicon vs Argon Comparison Compare Silicon with all Metalloid elements |