Estronsyo

Strontium
38Sr
Ca ↑ Sr ↓ Ba Periodic table rubidium ← strontium → yttrium
Appearance
silvery white metallic
General properties
Name, simbolo, kaiphan	strontium, Sr, 38
Pronunciation	Plantilya:IPAc-en Plantilya:Respell; Plantilya:IPAc-en Plantilya:Respell
Element category	puthaw
Group, period, block	2, 5, s
Standard atomic weight	87.62
Electron configuration	[Kr] 5s2 2, 8, 18, 8, 2
History
Discovery	William Cruickshank (1787)
First isolation	Humphry Davy (1808)
Physical properties
Phase	magahi
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 (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
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
Young's modulus	15.7 GPa
Shear modulus	6.03 GPa
Poisson ratio	0.28
Mohs hardness	1.5
CAS registry number	7440-24-6
Most stable isotopes
Main article: Isotopes of 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

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