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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): s
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, 3D>SrO, Sr2N3
reaction with 6M HCl:vigorous, 3D>H2, SrCl2 reaction with 6M HCl:vigorous, 3D>H2, SrCl2
reaction with 15M HNO3:vigorous, 3D>Sr(NO3)2, H2 reaction with 6M 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