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Strontium (Sr)

From Wikipedia, the free encyclopediaStrontium is a chemical element with symbol Sr and atomic number 38. An alkaline earth metal, strontium is a soft silver-white or yellowish metallic element that is highly reactive chemically. The metal turns yellow when it is exposed to air.
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Strontium in the periodic table

SymbolSr
Atomic number38
Group2
Period5
Blocks
Element categoryAlkaline Earth Metal

Physical properties

Phase at STPSolid
Density2.64 g/cm3
Atomic weight87.621 u
Melting point1050 K
776.85 °C
1430.33 °F
Boiling point1650 K
1376.85 °C
2510.33 °F

Atomära egenskaper

Electronegativity (Pauling Scale)0.95
Electron affinity5.023 kJ/mol
Ionization energies
1549.5 kJ/mol
2 1064.2 kJ/mol
3 4138 kJ/mol
4 5500 kJ/mol
5 6910 kJ/mol
6 8760 kJ/mol
7 10230 kJ/mol
8 11800 kJ/mol
9 15600 kJ/mol
10 17100 kJ/mol
11 31270 kJ/mol

Electron configuration

Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2
Electrons per shell2, 8, 18, 8, 2

History

Discovered1787
Discovered byWilliam Cruickshank