ରେଡ଼ିଅମ

ରେଡ଼ିଅମ ହେଉଛି ଏକ ରାସାୟନିକ ମୌଳିକ ଯାହାର ପ୍ରତୀକ Ra ଓ ପରମାଣୁ କ୍ରମାଙ୍କ ୮୮ ।

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

ଧର୍ମ

ସହାୟକ ଗ୍ରନ୍ଥ

• Kirby, H. W; Salutsky, Murrell L (1964). The Radiochemistry of Radium (PDF). National Academies Press.

ଆହୁରି ପଢନ୍ତୁ

• Albert Stwertka (1998). Guide to the Elements – Revised Edition. Oxford University Press. ISBN 0-19-508083-1.
• Denise Grady (October 6, 1998). "A Glow in the Dark, and a Lesson in Scientific Peril". The New York Times. Retrieved 2007-12-25.
• Nanny Fröman (1 December 1996). "Marie and Pierre Curie and the Discovery of Polonium and Radium". Nobel Foundation. Retrieved 2007-12-25.
• Clark, Claudia (1987). Radium Girls: Women and Industrial Health Reform, 1910–1935. University of North Carolina Press. ISBN 0-8078-4640-6.

ବାହାର ଲିଙ୍କ

• Lateral Science – Radium Discovery
• Photos of Radium Water Bath in Oklahoma
• NLM Hazardous Substances Databank – Radium, Radioactive
• Reproduction of a 1942 comic book ad selling a "Radiumscope" to children
• Annotated bibliography for radium from the Alsos Digital Library for Nuclear Issues
• The Poisoner Next Door – Japan Today, 10/20/2001
• Radium at The Periodic Table of Videos (University of Nottingham)