Periodic Table Element Comparison: Compare Elements - Helium vs Strontium
Compare Helium and Strontium 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 Helium vs Strontium with most reliable information about their properties, attributes, facts, uses etc. You can compare He vs Sr on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more. Helium and Strontium comparison table on more than 90 properties.
Helium and Strontium Comparison
Facts
| Name | Helium | Strontium |
|---|---|---|
| Atomic Number | 2 | 38 |
| Atomic Symbol | He | Sr |
| Atomic Weight | 4.002602 | 87.62 |
| Phase at STP | Gas | Solid |
| Color | Colorless | Silver |
| Metallic Classification | Noble Gas | Alkaline Earth Metal |
| Group in Periodic Table | group 18 | group 2 |
| Group Name | helium family or neon family | beryllium family |
| Period in Periodic Table | period 1 | period 5 |
| Block in Periodic Table | p -block | s -block |
| Electronic Configuration | 1s2 | [Kr] 5s2 |
| Electronic Shell Structure (Electrons per shell) | 2 | 2, 8, 18, 8, 2 |
| Melting Point | 0 K | 1050 K |
| Boiling Point | 4.22 K | 1655 K |
| CAS Number | CAS7440-59-7 | CAS7440-24-6 |
| Neighborhood Elements | Neighborhood Elements of Helium | Neighborhood Elements of Strontium |
History
| Parameter | Helium | Strontium |
|---|---|---|
| History | The element Helium was discovered by P. Janssen and N. Lockyer in year 1868 in Sweden and United Kingdom. Helium derived its name from the Greek word helios, meaning 'sun'. | The element Strontium was discovered by W. Cruikshank in year 1787 in United Kingdom. Strontium derived its name from Strontian, a small town in Scotland. |
| Discovery | P. Janssen and N. Lockyer (1868) | W. Cruikshank (1787) |
| Isolated | W. Ramsay,T. Cleve, and N. Langlet (1895) | H. Davy (1808) |
Presence: Abundance in Nature and Around Us
Parts per billion (ppb) by weight / by atoms (1ppb =10^-7 %)
| Property | Helium | Strontium |
|---|---|---|
| Abundance in Universe | 230000000 / 72000000 | 40 / 0.6 |
| Abundance in Sun | 230000000 / 74000000 | 50 / 0.7 |
| Abundance in Meteorites | - / - | 8900 / 2000 |
| Abundance in Earth's Crust | 5.5 / 30 | 360000 / 85000 |
| Abundance in Oceans | 0.0072 / 0.011 | 8100 / 570 |
| Abundance in Humans | - / - | 4600 / 330 |
Crystal Structure and Atomic Structure
| Property | Helium | Strontium |
|---|---|---|
| Atomic Volume | 22.4136 cm3/mol | 33.94 cm3/mol |
| Atomic Radius | 31 pm | 219 pm |
| Covalent Radius | 32 pm | 192 pm |
| Van der Waals Radius | 140 pm | 249 pm |
Atomic Spectrum - Spectral Lines | ||
| Emission Spectrum |  |  |
| Absorption Spectrum |  |  |
| Lattice Constant | 424.2, 424.2, 424.2 pm | 608.49, 608.49, 608.49 pm |
| Lattice Angle | π/2, π/2, π/2 | π/2, π/2, π/2 |
| Space Group Name | Fm_ 3m | Fm_ 3m |
| Space Group Number | 225 | 225 |
| Crystal Structure | Face Centered Cubic  | Face Centered Cubic |
Atomic and Orbital Properties
| Property | Helium | Strontium |
|---|---|---|
| Atomic Number | 2 | 38 |
| Number of Electrons (with no charge) | 2 | 38 |
| Number of Protons | 2 | 38 |
| Mass Number | 4.002602 | 87.62 |
| Number of Neutrons | 2 | 50 |
| Shell structure (Electrons per energy level) | 2 | 2, 8, 18, 8, 2 |
| Electron Configuration | 1s2 | [Kr] 5s2 |
| Valence Electrons | 1s2 | 5s2 |
| Oxidation State | - | 2 |
| Atomic Term Symbol (Quantum Numbers) | 1S0 | 1S0 |
| Shell structure |  |  |
Isotopes and Nuclear Properties
Helium has 2 stable naturally occuring isotopes while Strontium has 4 stable naturally occuring isotopes.
| Parameter | Helium | Strontium |
|---|---|---|
| Known Isotopes | 3He, 4He, 5He, 6He, 7He, 8He, 9He, 10He | 73Sr, 74Sr, 75Sr, 76Sr, 77Sr, 78Sr, 79Sr, 80Sr, 81Sr, 82Sr, 83Sr, 84Sr, 85Sr, 86Sr, 87Sr, 88Sr, 89Sr, 90Sr, 91Sr, 92Sr, 93Sr, 94Sr, 95Sr, 96Sr, 97Sr, 98Sr, 99Sr, 100Sr, 101Sr, 102Sr, 103Sr, 104Sr, 105Sr |
| Stable Isotopes | Naturally occurring stable isotopes: 3He, 4He | Naturally occurring stable isotopes: 84Sr, 86Sr, 87Sr, 88Sr |
| Neutron Cross Section | 0.007 | 1.2 |
| Neutron Mass Absorption | 0.00001 | 0.0005 |
Chemical Properties: Ionization Energies and electron affinity
| Property | Helium | Strontium |
|---|---|---|
| Valence or Valency | 0 | 2 |
| Electronegativity | - | 0.95 Pauling Scale |
| Electron Affinity | 0 kJ/mol | 5.03 kJ/mol |
| Ionization Energies | 1st: 2372.3 kJ/mol 2nd: 5250.5 kJ/mol | 1st: 549.5 kJ/mol 2nd: 1064.2 kJ/mol 3rd: 4138 kJ/mol 4th: 5500 kJ/mol 5th: 6910 kJ/mol 6th: 8760 kJ/mol 7th: 10230 kJ/mol 8th: 11800 kJ/mol 9th: 15600 kJ/mol 10th: 17100 kJ/mol 11th: 31270 kJ/mol |
Physical Properties
| Property | Helium | Strontium |
|---|---|---|
| Density | 0.0001785 g/cm3 | 2.63 g/cm3 |
| Molar Volume | 22.4136 cm3/mol | 33.94 cm3/mol |
Elastic Properties | ||
| Young Modulus | - | - |
| Shear Modulus | - | 6.1 GPa |
| Bulk Modulus | - | - |
| Poisson Ratio | - | 0.28 |
Hardness - Tests to Measure of Hardness of Element | ||
| Mohs Hardness | - | 1.5 MPa |
| Vickers Hardness | - | - |
| Brinell Hardness | - | - |
Electrical Properties | ||
| Electrical Conductivity | - | 7700000 S/m |
| Resistivity | - | 1.3e-7 m Ω |
| Superconducting Point | - | - |
Heat and Conduction Properties | ||
| Thermal Conductivity | 0.1513 W/(m K) | 35 W/(m K) |
| Thermal Expansion | - | 0.0000225 /K |
Magnetic Properties | ||
| Magnetic Type | Diamagnetic | Paramagnetic |
| Curie Point | - | - |
| Mass Magnetic Susceptibility | -5.9e-9 m3/kg | 1.32e-9 m3/kg |
| Molar Magnetic Susceptibility | -2.36e-11 m3/mol | 1.16e-10 m3/mol |
| Volume Magnetic Susceptibility | -1.05e-9 | 0.00000347 |
Optical Properties | ||
| Refractive Index | 1.000035 | - |
Acoustic Properties | ||
| Speed of Sound | 970 m/s | - |
Thermal Properties - Enthalpies and thermodynamics
| Property | Helium | Strontium |
|---|---|---|
| Melting Point | 0 K | 1050 K |
| Boiling Point | 4.22 K | 1655 K |
| Critical Temperature | 5.19 K | - |
| Superconducting Point | - | - |
Enthalpies | ||
| Heat of Fusion | 0.02 kJ/mol | 8 kJ/mol |
| Heat of Vaporization | 0.083 kJ/mol | 137 kJ/mol |
| Heat of Combustion | - | - |
Regulatory and Health - Health and Safety Parameters and Guidelines
| Parameter | Helium | Strontium |
|---|---|---|
| CAS Number | CAS7440-59-7 | CAS7440-24-6 |
| RTECS Number | RTECSMH6520000 | - |
| DOT Hazard Class | 2.2 | 4.2 |
| DOT Numbers | 1963 | 1383 |
| EU Number | - | - |
| NFPA Fire Rating | 0 | - |
| NFPA Health Rating | 1 | - |
| NFPA Reactivity Rating | 0 | - |
| NFPA Hazards | - | - |
| AutoIgnition Point | - | - |
| Flashpoint | - | - |
Compare With Other Elements
Compare Helium and Strontium with other elements of the periodic table.