ନେପ୍‌ଚୁନିଅମ

Neptunium,  ₉₃Np

ସାଧାରଣ ଗୁଣ
ନାମ, ପ୍ରତୀକ	neptunium, Np
Appearance	silvery metallic
ଉଚ୍ଚାରଣ	/nɛpˈtjuːniəm/ nep-TEW-nee-əm
Neptunium in the periodic table
Pm ↑ Np ↓ (Uqp) uranium ← neptunium → plutonium
ପରମାଣୁ କ୍ରମାଙ୍କ (Z)	93
ଶ୍ରେଣୀ, ବ୍ଳକ	group n/a, f-block
ପର୍ଯ୍ୟାୟ	period 7
ମୌଳିକ ପ୍ରକାର	actinide
ମାନକ ପରମାଣବିକ ଓଜନ (Ar)	(237)
ଇଲେକ୍‌ଟ୍ରୋନ୍ ବିନ୍ୟାସ	[Rn] 5f4 6d1 7s2
per shell	2, 8, 18, 32, 22, 9, 2
ଭୌତିକ ଗୁଣ
ଅବସ୍ଥା	solid
ଗଳନାଙ୍କ	910 K ​(637 °C, ​1179 °F)
ସ୍ଫୁଟନାଙ୍କ	4273 K ​(4000 °C, ​7232 °F)
Density near r.t.	20.45 g/cm3
Heat of fusion	3.20 kJ/mol
Heat of	336 kJ/mol
Molar heat capacity	29.46 J/(mol·K)
pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 2194 2437
Atomic properties
Oxidation states	7, 6, 5, 4, 3 (amphoteric oxide)
Electronegativity	Pauling scale: 1.36
Atomic radius	empirical: 155 pm
Covalent radius	190±1 pm
Miscellanea
Crystal structure	​orthorhombic
Thermal conductivity	6.3 W/(m·K)
Electrical resistivity	(22 °C) 1.220 µ Ω·m
Magnetic ordering	paramagnetic
CAS Number	7439-99-8
ଇତିହାସ
ଆବିଷ୍କାର	Edwin McMillan and Philip H. Abelson (1940)
Most stable isotopes of neptunium
iso NA half-life DM DE (MeV) DP 235Np syn 396.1 d α 5.192 231Pa ε 0.124 235U 236Np syn 1.54×105 y ε 0.940 236U β− 0.940 236Pu α 5.020 232Pa 237Np trace 2.144×106 y SF & α 4.959 233Pa 239Np trace 2.356 d β− 0.218 239Pu

ନେପ୍‌ଚୁନିଅମ ହେଉଛି ଏକ ରାସାୟନିକ ମୌଳିକ ଯାହାର ପ୍ରତୀକ Np ଓ ପରମାଣୁ କ୍ରମାଙ୍କ ୯୩ ।

ସହାୟକ ଗ୍ରନ୍ଥ

• Guide to the Elements – Revised Edition, Albert Stwertka, (Oxford University Press; 1998) ISBN 0-19-508083-1
• Lester R. Morss, Norman M. Edelstein, Jean Fuger (Hrsg.): The Chemistry of the Actinide and Transactinide Elements, Springer-Verlag, Dordrecht 2006, ISBN 1-4020-3555-1.
• Ida Noddack (1934). "Über das Element 93". Zeitschrift für Angewandte Chemie. 47 (37): 653. doi:10.1002/ange.19340473707.
• Eric Scerri, A Very Short Introduction to the Periodic Table, Oxford University Press, Oxford, 2011, ISBN 978-0-19-958249-5.

ବାହାର ଲିଙ୍କ

• Neptunium at The Periodic Table of Videos (University of Nottingham)
• Lab builds world's first neptunium sphere Archived 2006-09-25 at the Wayback Machine., U.S. Department of Energy Research News
• NLM Hazardous Substances Databank – Neptunium, Radioactive
• Neptunium: Human Health Fact Sheet
• C&EN: It's Elemental: The Periodic Table – Neptunium