Np - Neptunium - periodic table of the elements

Neptunium was produced by E. M. McMillan (who shared the 1951 Nobel Prize for Chemistry with Glenn Seaborg for the discovery of this and other transuranic elements) and P. Abelson in 1940 at Berkeley, and found naturally occuring in trace amounts in uranium minerals by Seaborg and Perlman in 1948.

Atomic number	-	93		Density	g/mL	20	.4
Atomic weight	u	237	.0482	Melting point	K	910
Bonding radius	A	-		Boiling point	K	-
Atomic radius	A	-		Heat of vaporization	kJ/mol	-
Ionization Potential	V	6	.19	Heat of fusion	kJ/mol	5	.19
Electronegativity	-	1	.36	Specific heat	J/gK	0	.12
The oxide is amphoteric.				Crystal are orthorhombic.
Electron configuration: [Rn] 5f⁴ 6d¹ 7s²

Other elements of the periodic table

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

H He

Li Be B C N O F Ne

Na Mg Al Si P S Cl Ar

K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr

Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe

Cs Ba La * Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn

Fr Ra Ac ** Rf Db Sg Bh Hs Mt 110 111 112 113

Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu

Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr