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 General | States | Energies | Oxidation & Electrons | Appearance & Characteristics | Reactions | Other Forms Radius | Conductivity | Abundance


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


state (s, l, g): s
melting point: 1042.2 K boiling point: 1654 K
Heat of fusion: 8.30 kJ/mol Heat of vaporization: 144.0 kJ/mol


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


reaction with air: vigorous, =>SrO, Sr2N3
reaction with 6M HCl: vigorous, =>H2, SrCl2 reaction with 6M HCl: vigorous, =>H2, SrCl2
reaction with 15M HNO3: vigorous, =>Sr(NO3)2, H2 reaction with 6M NaOH: none

Other Forms:

number of isotopes: 4 hydride(s): SrH2
oxide(s): SrO chloride(s): SrCl2


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


thermal conductivity: 35.4 J/m-sec-deg
electrical conductivity: 43.478 1/mohm-cm polarizability: 27.6 A^3


source: Celestite (sulfide)
rel. abund. solar system: 1.371 log abundance earth's crust: 2.6 log
cost, pure: 100 $/100g cost, bulk: $/100g