General: |
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Name: Strontium
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Symbol: Sr
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Group: Alkali Earth
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Atomic weight: 87.62
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Density @ 293 K: 2.6 g/cm3
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Atomic volume: 33.7 cm3/mol
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Group: Alkali Earth
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discovered: 1808
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States: |
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state (s, l, g): s
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melting point: 1042.2 K
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boiling point: 1654 K
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Heat of fusion: 8.30 kJ/mol
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Heat of vaporization: 144.0 kJ/mol
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Energies: |
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1st ionization energy: 549.5 kJ/mole
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electronegativity: 0.95
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2nd ionization energy: 1064.2 kJ/mole
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electron affinity: kJ/mole
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3rd ionization energy: 4206.7 kJ/mole
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Specific heat: 0.30 J/gK
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heat atomization: 164 kJ/mole atoms
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Oxidation & Electrons: |
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Shells: 2,8,18,8,2
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electron configuration: [Kr] 5s2
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minimum oxidation number: 0
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maximum oxidation number: 2
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min. common oxidation no.: 0
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max. common oxidation no.: 2
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Appearance & Characteristics: |
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structure: hcp: hexagonal close pkd
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color: silvery
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uses: fireworks (red flame)
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toxicity:
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hardness: 1.8 mohs
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characteristics: tarnishes
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Reactions: |
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reaction with air: vigorous, =>SrO, Sr2N3
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reaction with 6M HCl: vigorous, =>H2, SrCl2
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reaction with 6M HCl: vigorous, =>H2, SrCl2
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reaction with 15M HNO3: vigorous, =>Sr(NO3)2, H2
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reaction with 6M NaOH: none
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Other Forms: |
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number of isotopes: 4
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hydride(s): SrH2
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oxide(s): SrO
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chloride(s): SrCl2
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Radius: |
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ionic radius (2- ion): pm
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ionic radius (1- ion): pm
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atomic radius: 215 pm
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ionic radius (1+ ion): pm
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ionic radius (2+ ion): 132 pm
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ionic radius (3+ ion): pm
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Conductivity: |
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thermal conductivity: 35.4 J/m-sec-deg
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electrical conductivity: 43.478 1/mohm-cm
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polarizability: 27.6 A^3
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Abundance: |
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source: Celestite (sulfide)
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rel. abund. solar system: 1.371 log
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abundance earth's crust: 2.6 log
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cost, pure: 100 $/100g
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cost, bulk: $/100g
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