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38
Sr
87.62
Strontium |
Appearance & Characteristics | Reactions |
Other Forms Radius | Conductivity | Abundance
General:
| Name: Strontium | Symbol: Sr |
| Group: Alkali Earth | Atomic weight: 87.62 |
| Density @ 293 K: 2.6 g/cm3 | Atomic volume: 33.7 cm3/mol |
| Group: Alkali Earth | Discovered: 1808 |
States
| State (s, l, g): solid | |
| Melting point: 1042.2 K | Boiling point: 1654 K |
| Heat of fusion: 8.30 kJ/mol | Heat of vaporization: 144.0 kJ/mol |
Energies
| 1st ionization energy: 549.5 kJ/mole | |
| Electronegativity: 0.95 | 2nd ionization energy: 1064.2 kJ/mole |
| Electron affinity: kJ/mole | 3rd ionization energy: 4206.7 kJ/mole |
| Specific heat: 0.30 J/gK | Heat atomization: 164 kJ/mole atoms |
Oxidation & Electrons
| Shells: 2,8,18,8,2 | Electron configuration: [Kr] 5s2 |
| Minimum oxidation number: 0 | Maximum oxidation number: 2 |
| Min. common oxidation no.: 0 | Max. common oxidation no.: 2 |
Appearance & Characteristics
| Structure: hcp: hexagonal close pkd | Color: silvery |
| Uses: fireworks (red flame) | Toxicity: |
| Hardness: 1.8 mohs | Characteristics: tarnishes |
Reactions
| Reaction with air: vigorous, => SrO, Sr2N3 | |
| Reaction with 6 M HCl: vigorous, => H2, SrCl2 | Reaction with 6 M HCl: vigorous, => H2, SrCl2 |
| Reaction with 15 M HNO3: vigorous, => Sr(NO3)2, H2 | Reaction with 6 M NaOH: none |
Other Forms
| Number of isotopes: 4 | Hydride(s): SrH2 |
| Oxide(s): SrO | Chloride(s): SrCl2 |
Radius
| Ionic radius (2- ion): pm | Ionic radius (1- ion): pm |
| Atomic radius: 215 pm | Ionic radius (1+ ion): pm |
| Ionic radius (2+ ion): 132 pm | Ionic radius (3+ ion): pm |
Conductivity
| Thermal conductivity: 35.4 J/m-sec-deg | |
| Electrical conductivity: 43.478 1/mohm-cm | Polarizability: 27.6 A^3 |
Abundance
| Source: Celestite (sulfide) | |
| Rel. abund. solar system: 1.371 log | Abundance earth's crust: 2.6 log |
| cost, pure: 100 $/100g | cost, bulk: $/100g |
