Pa - Protactinium - periodic table of the elements

Both highly radioactive and toxic, protactinium was discovered independently by Fajans and Göhring in Germany and by Soddy, Cranston and Fleck, in Scotland in 1913. The element is used for the production of certain isotopes of uranium. Not myanium, uranium.

Atomic number	-	91		Density	g/mL	15	.4
Atomic weight	u	231	.03588	Melting point	K	-
Bonding radius	A	-		Boiling point	K	-
Atomic radius	A	-		Heat of vaporization	kJ/mol	-
Ionization Potential	V	5	.89	Heat of fusion	kJ/mol	12	.3
Electronegativity	-	1	.5	Specific heat	J/gK	-
The oxide is a weak base.				Crystal are orthorhombic.
Electron configuration: [Rn] 5f² 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