Strontium

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Strontium
38Sr
Ca

Sr

Ba
rubidiumstrontiumyttrium
Ìhànsójú
silvery white metallic
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà strontium, Sr, 38
Ìpèlóhùn /ˈstrɒnʃiəm/
STRON-shee-əm;
/ˈstrɒntiəm/
STRON-tee-əm;
/ˈstrɒnʃəm/ STRON-shəm
Ẹ̀ka ẹ́límẹ̀nti alkaline earth metal
Ẹgbẹ́, àsìkò, àdìpò 25, s
Ìwúwo átọ́mù 87.62
Ìtòléra ẹ̀lẹ́ktrónì [Kr] 5s2
2, 8, 18, 8, 2
Physical properties
Phase solid
Density (near r.t.) 2.64 g·cm−3
Liquid density at m.p. 2.375 g·cm−3
Melting point 1050 K, 777 °C, 1431 °F
Boiling point 1655 K, 1382 °C, 2520 °F
Heat of fusion 7.43 kJ·mol−1
Heat of vaporization 136.9 kJ·mol−1
Molar heat capacity 26.4 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 796 882 990 1139 1345 1646
Atomic properties
Oxidation states 2, 1[1] (strongly basic oxide)
Electronegativity 0.95 (Pauling scale)
Ionization energies 1st: 549.5 kJ·mol−1
2nd: 1064.2 kJ·mol−1
3rd: 4138 kJ·mol−1
Atomic radius 215 pm
Covalent radius 195±10 pm
Van der Waals radius 249 pm
Miscellanea
Crystal structure face-centered cubic
Strontium has a face-centered cubic crystal structure
Magnetic ordering paramagnetic
Electrical resistivity (20 °C) 132 nΩ·m
Thermal conductivity 35.4 W·m−1·K−1
Thermal expansion (25 °C) 22.5 µm·m−1·K−1
Shear modulus 6.1 GPa
Poisson ratio 0.28
Mohs hardness 1.5
CAS registry number 7440-24-6
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù strontium
iso NA half-life DM DE (MeV) DP
82Sr syn 25.36 d ε - 82Rb
83Sr syn 1.35 d ε - 83Rb
β+ 1.23 83Rb
γ 0.76, 0.36 -
84Sr 0.56% 84Sr is stable with 46 neutrons
85Sr syn 64.84 d ε - 85Rb
γ 0.514D -
86Sr 9.86% 86Sr is stable with 48 neutrons
87Sr 7.0% 87Sr is stable with 49 neutrons
88Sr 82.58% 88Sr is stable with 50 neutrons
89Sr syn 50.52 d ε 1.49 89Rb
β 0.909D 89Y
90Sr trace 28.90 y β 0.546 90Y
· r


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