ଛାଞ୍ଚ:Infobox Radium

Radium,  ₈₈Ra

ସାଧାରଣ ଗୁଣ
ନାମ, ପ୍ରତୀକ	radium, Ra
Appearance	silvery white metallic
ଉଚ୍ଚାରଣ	/ˈreɪdiəm/ RAY-dee-əm
Radium in the periodic table
Ba ↑ Ra ↓ Ubn francium ← radium → actinium
ପରମାଣୁ କ୍ରମାଙ୍କ (Z)	88
ଶ୍ରେଣୀ, ବ୍ଳକ	group 2 (alkaline earth metals), s-block
ପର୍ଯ୍ୟାୟ	period 7
ମୌଳିକ ପ୍ରକାର	alkaline earth metal
ମାନକ ପରମାଣବିକ ଓଜନ (Ar)	(226)
ଇଲେକ୍‌ଟ୍ରୋନ୍ ବିନ୍ୟାସ	[Rn] 7s2
per shell	2, 8, 18, 32, 18, 8, 2
ଭୌତିକ ଗୁଣ
ଅବସ୍ଥା	solid
ଗଳନାଙ୍କ	973 K ​(700 °C, ​1292 °F)
ସ୍ଫୁଟନାଙ୍କ	2010 K ​(1737 °C, ​3158.6 °F)
Density near r.t.	5.5 g/cm3
Heat of fusion	8.5 kJ/mol
Heat of	113 kJ/mol
pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 819 906 1037 1209 1446 1799
Atomic properties
Oxidation states	2 (strongly basic oxide)
Electronegativity	Pauling scale: 0.9
Covalent radius	221±2 pm
Van der Waals radius	283 pm
Miscellanea
Crystal structure	​body-centered cubic (bcc)
Thermal conductivity	18.6 W/(m·K)
Electrical resistivity	1 µ Ω·m (at 20 °C)
Magnetic ordering	nonmagnetic
CAS Number	7440-14-4
ଇତିହାସ
ଆବିଷ୍କାର	Pierre Curie and Marie Curie (1898)
First isolation	Marie Curie (1902)
Most stable isotopes of radium
iso NA half-life DM DE (MeV) DP 223Ra trace 11.43 d α 5.99 219Rn 224Ra trace 3.6319 d α 5.789 220Rn 226Ra trace 1601 y α 4.871 222Rn 228Ra trace 5.75 y β− 0.046 228Ac

References

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