• Class: Alkalines
• Period: 5
• IUPAC group: 2
• Traditional: IIa

• Discovered in: 1808 by Davy
• Origin of name: Strontian, town in Scotland
• Historical or alternate name:

Celestite (SrSO4) & strontianite (SrCO3)

Soft, silvery white metal. CombusTABLE in air, will react with water. Exposed surfaces form protective oxide film.

• Atmosphere: ~0.0 ppm
• Primitive mantle: 17.8 ppm
• Sea water: 8 ppm
• Metallic meteorite: 7.91 ppm
• Continental crust: 260.0 ppm
• Solar photosphere: 2.90 log of abundance
• Oceanic crust: 130.0 ppm
• Solar system: 23.8 relative to Si=1.0e6

   Hazards

Metal ignites and burns readily. Reacts with water and oxidants. Metal moderately toxic by ingestion and inhalation..

• Lower:1.0
• Upper:100.0

Strontium Physical Properties

 Transitional Data

• State: Solid
• Density: 2.6 g/cm3

 Molar enthalpy

• Atomization: 164.4 kJ mol-1
• Fusion: 9.16 kJ mol-1
• Vaporization: 154.4 kJ mol-1

 Transition points

• Melting point: 1042.0 K
• Boiling point: 1657.0 K
• Critical temperature: 3059.0 K

 Molar properties

• Atomic weight: 87.62 g/mole
• Molar volume: 34.07 cm3 mol-1

 Crystal structure sequence

face-centered-cubic <486 K < hexagonal-close-packed < 878 K < body-centered-cubic < melting point

 Thermodynamics

• State: solid
  • Enthalpy 0
  • Gibbs function 0
  • Entropy 52.3
  • Heat Capacity 26.4

• State: gas
  • Enthalpy 164.4
  • Gibbs function 130.9
  • Entropy 164.62
  • Heat Capacity 20.786

 Miscellaneous physical

• Electrical resistivity: 23.0 µ-ohms/cm
• Debye temperature: 147.0 K
• Thermal conductivity: 49.0 W / m / K
• Coefficient of linear expansion: 22.5Coef. per K
• Mass magnetic susceptibility: 1.32e-8
• X-ray diffraction mass absorption coefficients:
• CuK: 125 (µ/p)/cm2 g-1
• MoK: 95.0 (µ/p)/cm2 g-1

Strontium Chemical Properties

 Chemical basics:

• Oxidation states: +2
• Molecular wt: 87.62 g/mole

 Radii

• Covalent: 192 pm
• Atomic: 215.0 pm
• Van der Waals: pm

 Ions:

• ion: +2 pm 118.0

 Covalent bonds

 Effective nuclear charge

• Slater: 2.85
• Clementi: 6.07
• Froese-Fischer: 8.09

 Electronegativity

• Pauling: 1.0
• Allred-Rochow: 0.99

 Standard reactions

Strontium Nuclear Properties

• Known 18
• Listed 8

• Known 80 - 95
• Listed 82 - 90

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 25.5 days
  • Decay mode: E.C.,
  • Source: reactor
• Notes

• % Occ.:Natural 0.56%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 64.9 days
  • Decay mode: E.C.,
  • Source: reactor
• Notes med

• % Occ.:Natural 9.86%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural 7.00%
• Mossbauer NRA:
• Nuclear spin/Quantum no.: 9/2
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural 82.58%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 50.5 days
  • Decay mode: Beta-
  • Source: reactor
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 28.5 years
  • Decay mode: Beta-
  • Source: reactor
• Notes med

• Isotope Cross-section 1.21±0.06 barns

• Absolute sensitivity: 1.88e-4 1H=1.0
• Relative sensitivity: 2.69e-3 1H=1.0
• Receptivity: 1.07 13C=1.0
• Magnetogyric ratio: -1.1593e7 rad / T / s
• Quadropole moment: 0.36e-28 m2
• Frequency: 4.333 MHz
• Reference: Sr+2

Strontium Energy Properties

Electrons

• Ground state electron configuration: [Kr] 5s2
• Electron affinity: -146 kJ mol-1
• Filling orbitals:

Spectral lines

 Ionization energies

 Atomic energy levels