کينډۍ:Infobox radium

Radium,  ₈₈Ra

عمومي خواص
Pronunciation	/ˈreɪdiəm/ RAY-dee-əm
Appearance	silvery white metallic
Radium په دوراني جدول کې
Ba ↑ Ra ↓ (Ubn) francium ← radium → actinium ‍
اټومي شمیره (Z)	88
گروپ, پیریود	group 2 (alkaline earth metals), period 7
بلاک	s-block
Element category	alkaline earth metal
Mass number	226 (most stable isotope)
Electron configuration	[Rn] 7s2
Electrons per shell	2, 8, 18, 32, 18, 8, 2
فزیکي خواص
حالت (at STP)	جامد
دويلې کيدو ټکى	973 K ​(700 °C, ​1292 °F) (disputed)
يشنا ټکی	2010 K ​(1737 °C, ​3159 °F)
Density near r.t.	5.5 g/cm3
Heat of fusion	8.5 kJ/mol
Heat of vaporization	113 kJ/mol
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 819 906 1037 1209 1446 1799
اټومي خواص
Oxidation states	2 ​(expected to have a strongly basic oxide)
Electronegativity	Pauling scale: 0.9
Ionization energies	1st: 509.3 kJ/mol 2nd: 979.0 kJ/mol
Covalent radius	221±2 pm
Van der Waals radius	283 pm
Miscellanea
Crystal structure	​body-centered cubic (bcc) Body-centered cubic crystal structure for radium
د تودوخې تېرېدنه	18.6 W/(m·K)
Electrical resistivity	1 µΩ·m (at 20 °C)
Magnetic ordering	nonmagnetic
CAS Number	7440-14-4
History
Discovery	Pierre and Marie Curie (1898)
First isolation	Marie Curie (1910)
Main isotopes of radium
آيسو­ټوپ Abun­dance نیم ژوند (t1/2) Decay mode Pro­duct 223Ra trace 11.43 d α 219Rn 224Ra trace 3.6319 d α 220Rn 225Ra trace 14.9 d β− 225Ac 226Ra trace 1600 y α 222Rn 228Ra trace 5.75 y β− 228Ac

Element navigation

PTradiumPT

Fr ←

iso 88Ra ibox    wd:Q1128

→ Ac

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