Chemicool

Sr

38

87.62
Strontium
General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles

General
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

States
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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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
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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 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

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
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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
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