Strontium

Strontium
38Sr
Ca ↑ Sr ↓ Ba Tábìlì ìdásìkò rubidium ← strontium → yttrium
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	2, 5, 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 (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
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