ଛାଞ୍ଚ:Infobox Promethium

Promethium,  ₆₁Pm

ସାଧାରଣ ଗୁଣ
ନାମ, ପ୍ରତୀକ	promethium, Pm
Appearance	metallic
ଉଚ୍ଚାରଣ	/prˈmiːθiəm/ pro-MEE-thee-əm
Promethium in the periodic table
- ↑ Pm ↓ Np neodymium ← promethium → samarium
ପରମାଣୁ କ୍ରମାଙ୍କ (Z)	61
ଶ୍ରେଣୀ, ବ୍ଳକ	group n/a, f-block
ପର୍ଯ୍ୟାୟ	period 6
ମୌଳିକ ପ୍ରକାର	lanthanide
ମାନକ ପରମାଣବିକ ଓଜନ (Ar)	[145]
ଇଲେକ୍‌ଟ୍ରୋନ୍ ବିନ୍ୟାସ	[Xe] 6s2 4f5
per shell	2, 8, 18, 23, 8, 2
ଭୌତିକ ଗୁଣ
ଅବସ୍ଥା	solid
ଗଳନାଙ୍କ	1315 K ​(1042 °C, ​1908 °F)
ସ୍ଫୁଟନାଙ୍କ	3273 K ​(3000 °C, ​5432 °F)
Density near r.t.	7.26 g/cm3
Heat of fusion	7.13 kJ/mol
Heat of	289 kJ/mol
Atomic properties
Oxidation states	3 (mildly basic oxide)
Electronegativity	Pauling scale: ? 1.13
Atomic radius	empirical: 183 pm
Covalent radius	199 pm
Miscellanea
Crystal structure	​hexagonal
Thermal expansion	(r.t.) (α, poly) est. 11 µm/(m·K)
Thermal conductivity	17.9 W/(m·K)
Electrical resistivity	(r.t.) est. 0.75 µ Ω·m
Magnetic ordering	paramagnetic
Young's modulus	(α form) est. 46 GPa
Shear modulus	(α form) est. 18 GPa
Bulk modulus	(α form) est. 33 GPa
Poisson ratio	(α form) est. 0.28
CAS Number	7440-12-2
ଇତିହାସ
ଆବିଷ୍କାର	Chien Shiung Wu, Emilio Segrè, Hans Bethe (1942)
First isolation	Charles D. Coryell, Jacob A. Marinsky, Lawrence E. Glendenin, Harold G. Richter (1945)
Named by	Grace Mary Coryell (1945)
Most stable isotopes of promethium
iso NA half-life DM DE (MeV) DP 145Pm syn 17.7 y ε 0.163 145Nd 146Pm syn 5.53 y ε 1.472 146Nd β− 1.542 146Sm 147Pm trace 2.6234 y β− 0.224 147Sm

References

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