ପୋଲୋନିଅମ

ଇଂରାଜୀ ଲିଙ୍କ

https://or.wikipedia.org/wiki/Polonium

Polonium,₈₄Po

ସାଧାରଣ ଗୁଣ
ନାମ,ପ୍ରତୀକ	polonium, Po
Appearance	silvery
ଉଚ୍ଚାରଣ	/pˈloʊniəm/po-LOH-nee-əm
Polonium in theperiodic table
Te ↑ Po ↓ Lv bismuth←polonium→astatine
ପରମାଣୁ କ୍ରମାଙ୍କ(Z)	84
ଶ୍ରେଣୀ,ବ୍ଳକ	group 16 (chalcogens),p-block
ପର୍ଯ୍ୟାୟ	period 6
ମୌଳିକ ପ୍ରକାର	post-transition metal,post-transition metal status is disputed (see article text)
ମାନକ ପରମାଣବିକ ଓଜନ(Ar)	(209)
ଇଲେକ୍ଟ୍ରୋନ୍ ବିନ୍ୟାସ	[Xe] 6s24f145d106p4
per shell	2, 8, 18, 32, 18, 6
ଭୌତିକ ଗୁଣ
ଅବସ୍ଥା	solid
ଗଳନାଙ୍କ	527K​(254 °C, ​489 °F)
ସ୍ଫୁଟନାଙ୍କ	1235 K ​(962 °C, ​1764 °F)
Densitynearr.t.	(alpha) 9.196 g/cm3 (beta) 9.398 g/cm3
Heat of fusion	ca. 13kJ/mol
Heat of	102.91 kJ/mol
Molar heat capacity	26.4 J/(mol·K)
pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) (846) 1003 1236
Atomic properties
Oxidation states	6,4,2, −2 (amphotericoxide)
Electronegativity	Pauling scale: 2.0
Atomic radius	empirical: 168pm
Covalent radius	140±4 pm
Van der Waals radius	197pm
Miscellanea
Crystal structure	​cubic
Thermal expansion	23.5 µm/(m·K) (at 25 °C)
Thermal conductivity	?20 W/(m·K)
Electrical resistivity	(α) 0.40 µ Ω·m (at 0 °C)
Magnetic ordering	nonmagnetic
CAS Number	7440-08-6
ଇତିହାସ
ଆବିଷ୍କାର	Pierre CurieandMarie Curie(1898)
First isolation	Willy Marckwald(1902)
Most stableisotopes of polonium
iso NA half-life DM DE(MeV) DP 208Po syn 2.898y α 5.215 204Pb β+ 1.401 208Bi 209Po syn 103 y α 4.979 205Pb β+ 1.893 209Bi 210Po trace 138.376d α 5.307 206Pb

ପୋଲୋନିଅମହେଉଛି ଏକରାସାୟନିକ ମୌଳିକଯାହାର ପ୍ରତୀକPoଓପରମାଣୁ କ୍ରମାଙ୍କ୮୪ ।

ସହାୟକ ଗ୍ରନ୍ଥ

• Bagnall, K. W. (1962). "The Chemistry of Polonium".Advances in Inorganic Chemistry and Radiochemistry.Vol. 4. New York:Academic Press.pp. 197–226.doi:10.1016/S0065-2792(08)60268-X.ISBN0-12-023604-4.RetrievedJune 14,2012.

ବାହାର ଲିଙ୍କ

• Chemistry in its element podcast(MP3) from theRoyal Society of Chemistry'sChemistry World:Polonium
• PoloniumatThe Periodic Table of Videos(University of Nottingham)