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91 Pa Protactinium (plaintext)
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 Ds Rg Cn Nh Fl Mc Lv Ts Og
Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Th[Pa]U Np Pu Am Cm Bk Cf Es Fm Md No Lr
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+--------------------+
| 91 ____ |
| | _ \ __ _ |
| | |_) / _` | |
| | __/ (_| | |
| |_| \__,_| |
| |
| Protactinium |
| 231.03588 u |
+--------------------+
Wiki Article: Protactinium
Electron Configuration: [Rn]7s2 5f2 6d1
Electronegativity: 1.5
Atomic Radius: 243 pm
Ionization Energy: 5.89 eV
Electron Affinity:
Oxidation States: +5, +4
Standard State: Solid
Melting Point: 1845 K
Boiling Point:
Density: 15.37 g/cm3
Family: Actinide
Year Discovered: 1913
Number of Neutrons: 140
Number of Protons: 91
Number of Electrons: 91
Number of Valence:
Valency:
Group:
Period: 7
Shell: f-shell
Specific Heat:
Radioactive: 1
Occurrence: Natural
Source: Radioactive decay
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