रेडियम

रेडियम, ₀₀Ra
	Radium electroplated on a very small sample of copper foil and covered with polyurethane to prevent reaction with the air
रेडियम
Pronunciation	/ˈreɪdiəm/ (ray-DEE-əm)
Appearance	silvery white metallic
Mass number	[226]
रेडियम in the periodic table
	फ्रान्सियम ← रेडियम → एक्टिनियम
Group	group 2 (alkaline earth metals)
Period	period 7
Block	s-block
Electron configuration	[Rn] 7s2
Electrons per shell	2, 8, 18, 32, 18, 8, 2
Physical properties
Phase at STP	solid
Melting point	973 K (700 °C, 1292 °F)
Boiling point	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
Atomic properties
Oxidation states	साधारण: +2;
Electronegativity	Pauling scale: 0.9
Covalent radius	221±2 pm
Van der Waals radius	283 pm
	Color lines in a spectral rangeSpectral lines of रेडियम
Other properties
Natural occurrence	from decay
Crystal structure	(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
History
Discovery	पियरे क्युरी व मेरी क्युरी (1898)
First isolation	मेरी क्युरी (1902)
Isotopes of रेडियम v; e;
	Template:infobox रेडियम isotopes does not exist
	Category: रेडियम; view; talk; edit; \| references

रेडियम छगु तत्त्व (एलेमेन्ट) ख। थ्व धातु मानक क्वाजः व चापय् झझखाइगु, वहःथें-तुइसे च्वनिगु, व भति-भति रियाक्टिभ जुइय। ^[१] केमिकल रियाक्सनय् थ्व धातुं थःगु निगु भ्यालेन्स इलेक्ट्रोन अपुइक हे त्वता +2 चार्जया क्याटआयन जुइ। ^[२] थ्व धातुया दकले पिनेया इलेक्ट्रोन एस अर्बाइटलय् लाःगु जुगुलिं थ्व धातु पिरियोडिक टेबलया s-ब्लकय् ला। ^[१]^[३]^[४]थ्व धातु पृथ्वीइ प्राकृतिक रुपय् दु।^[५]

लिधंसा

1 2 Royal Society of Chemistry. Visual Elements: Group 2–The Alkaline Earth Metals. Visual Elements. Royal Society of Chemistry. 13 January 2012 कथं।
↑ (1997) Chemistry of the Elements, 2nd, Butterworth–Heinemann.
↑ Periodic Table: Atomic Properties of the Elements. nist.gov. National Institute of Standards and Technology (September 2010). 17 February 2012 कथं।
↑ (2003) Lide, D. R. CRC Handbook of Chemistry and Physics, 84th, Boca Raton, FL: CRC Press.
↑ Abundance in Earth's Crust. WebElements.com. 14 April 2007 कथं।

स्वयादिसँ

विकिमिडिया मंका य् थ्व विषय नाप स्वापु दुगु मिडिया दु: Radium

[rsc-1] 1 2 Royal Society of Chemistry. Visual Elements: Group 2–The Alkaline Earth Metals. Visual Elements. Royal Society of Chemistry. 13 January 2012 कथं।

[Greenwood&Earnshaw-2] (1997) Chemistry of the Elements, 2nd, Butterworth–Heinemann.

[3] Periodic Table: Atomic Properties of the Elements. nist.gov. National Institute of Standards and Technology (September 2010). 17 February 2012 कथं।

[RubberBible84th-4] (2003) Lide, D. R. CRC Handbook of Chemistry and Physics, 84th, Boca Raton, FL: CRC Press.

[webelements-occurrence-5] Abundance in Earth's Crust. WebElements.com. 14 April 2007 कथं।

[१]

[२]

[३]

[४]

[५]

v t e पिरियोडिक टेबल
	1	2															3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
1	H																															He
2	Li	Be																									B	C	N	O	F	Ne
3	Na	Mg																									Al	Si	P	S	Cl	Ar
4	K	Ca															Sc	Ti	V	Cr	Mn	Fe	Co	Ni	Cu	Zn	Ga	Ge	As	Se	Br	Kr
5	Rb	Sr															Y	Zr	Nb	Mo	Tc	Ru	Rh	Pd	Ag	Cd	In	Sn	Sb	Te	I	Xe
6	Cs	Ba	La	Ce	Pr	Nd	Pm	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Hf	Ta	W	Re	Os	Ir	Pt	Au	Hg	Tl	Pb	Bi	Po	At	Rn
7	Fr	Ra	Ac	Th	Pa	U	Np	Pu	Am	Cm	Bk	Cf	Es	Fm	Md	No	Lr	Rf	Db	Sg	Bh	Hs	Mt	Ds	Rg	Cn	Uut	Fl	Uup	Lv	Uus	Uuo
परिमार्जित