Periodic Table of the Elements
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Bottom FACULTY OF CHEMICAL TECHNOLOGY o PERIODIC TABLE OF THE ELEMENTS Bottom
  A B C D E F G H I J K L M N O P R S T U V X Z  
Periodic Table of the Elements Tableau périodique des éléments Periodni sustav elemenata Tavola periodica degli elementi Das Periodensystem der Elemente
Strontium Strontium Stroncij Stronzio Strontium

 
Atomic number: 38
Group numbers: 2
Period: 5
 
Discovery date: 1808
Sr

Strontium
NEIGHBOURS
19
K
 20
Ca
 21
Sc
37
Rb
 38
Sr
 39
Y
55
Cs
 56
Ba
 57
La


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Strontium was discovered by Sir Humphry Davy (England) in 1808. Named after the village of Strontian in Scotland. It is soft, malleable, silvery-yellow metal. Combustible in air, will react with water. Exposed surfaces form protective oxide film. Metal ignites and burns readily.
Bottom ALKALINE EARTH METAL Top

Relative atomic mass: 87.62(1) Electronic configuration: [Kr] 5s2
Formal oxidation number: +2 Electronegativities: 0.95
Thermal conductivity: 49 W m-1 K-1 Electrical resistivity (20 °C): 23 μΩcm
Atomic radius: 215.1 pm Standard state (20 °C): solid
Density (g dm-3): 2540 (293 K)
2375 (m.p.)		 Molar volume (cm3 mol-1): 34.50 (293 K)
36.89 (m.p.)


Bottom THERMAL PROPERTIES Top

Melting point: 777 °C Heat of fusion: 9.16 kJ mol-1
Boiling point: 1382 °C Heat of vaporization: 154.4 kJ mol-1
Critical temperature: 2786 °C Heat of atomization: 164.4 kJ mol-1


Bottom IONIZATION ENERGIES AND ABUNDANCE Top

1st ionization energy: 549.48 kJ mol-1 Abundance of element (air): - ppm
2nd ionization energy: 1064.25 kJ mol-1 Abundance of element (Earth's crust): 260 ppm
3rd ionization energy: 4138.29 kJ mol-1 Abundance of element (oceans): 8 ppm


Bottom ISOTOPES Top

Isotopes Relative atomic mass Abundance (%)
84Sr83.913425(4)0.56(1)
86Sr85.909262(2)9.86(1)
87Sr86.908879(2)7.00(1)
88Sr87.905614(2)82.58(1)


Bottom MINERALS AND USES Top

Strontium is found in minerals celestite and strontianite. Used in flares and fireworks for crimson colour. Strontium-90 is a long lived highly radioactive fallout product of atomic-bomb explosions. The price of 99 % pure strontium ingot is 322.30 € for 1000 g.

Bottom REDUCTION POTENTIALS Top

Balanced half-reaction   Eo / V      Annotation
Sr2+ + 2e- = Sr(s) - 2.89  

 

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