Np	Z =  93	◊ ◊ ◊ ◊ ◊	Neptunium
			From the Latin "Neptunus", meaning "Neptune"
(AM) Atomic Mass	237.0482  amu	♦	Oxidation States	+3, +4, +5, +6
(BP) Boiling Point	3902  °C	♦	(MP) Melting Point	640  °C
(ρ) Density	n/a	♦	Crystal Structure	Orthorhombic
( χ ) Electronegativity	1.3	♦	(AR) Atomic Radius	n/a
Physical State	Solid	♦	(C) Heat Capacity	n/a
Electronic-Config	[Rn]  5f4  6d1  7s2	♦	(I1) First Ionization E	597.24  kJ/mol
(ΔHvap) Heat of Vaporization	336  kJ/mol	♦	(ΔHfus) Heat of Fusion	3.2  kJ/mol
Year of Discovery	1940	♦	Location of Discovery	U. Cal, Berkley
(E°) Standard Potential	Np3+⇔ Np (-1.856 V)
Stable isotopes	None. All isotopes are man-made and radioactive
Discovered/Synthesized by	Edwin M. McMillian, Philip H. Abelson
Natural Source	Not found in nature, man-made, synthetic
Common Uses	Neutron detectors, dosimeters, possibly nuclear weapons
Other Info	First actinide to be synthesized
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