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


Name Strontium Symbol Sr
atomic number 38 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
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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
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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
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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
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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
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World Wide Web presentation of Chemicool Periodic Table is © Copyright 1996-99 by David D. Hsu. Some data were provided by and used with the permission of JCE Software and is owned and copyright by the Division of Chemical Education, Inc. Additional data were provided by Perkin-Elmer through Peter Lykos of IIT. The information may not be redistributed without the permission of David Hsu or JCE Software.