Protactinium-Anti Protactinium
Protactinium is named after the Greek word: protos (first); 
it is the parent of actinium, which is formed by radioactive decay.

Protactinium (Pa) Properties	AProtactinium (APa) Properties  1/
Nuclear (91 protons/electrons) Atomic Number: 91 Atomic Mass: 231.036 Atomic Energy: 0.345 Ergs Group: 3; Period: 7 Family: Rare Earth: Actinide Series Bonding Radius: ? Angstroms Atomic Radius: ?  Angstroms Atomic Volume: 15.0 cm3mol-1 29 Isotopes: 212APa  to  240APa Stable Isotopes: None	Nuclear (91 Aprotons/positrons) Atomic Number: 91 Atomic Mass: 231.036 Atomic Energy: 0.345 Ergs Group: 3; Period: 7 Family: Rare Earth: Actinide Series Bonding Radius:  ? Angstroms Atomic Radius: ? Angstroms Atomic Volume: 15.0 cm3mol-1 29 AIsotopes: 212APa  to  240APa Stable AIsotopes: None
Physical  Radioactive metal Density: 15.4 g cm-3 Melting Point: 1,600 oC   Boiling Point: ? oC   Specific Heat: 0.12 J g-1 K-1 Heat of Vaporization: ? kJ mol-1 Heat of Fusion: 12.3 kJ mol-1 Electrical Conductivity: 0.0529 106 cm-1 Ohm-1 Thermal Conductivity: 0.47 W cm-1 K-1	Physical  Radioactive metal Density: 15.4 g/cm-3 Melting Point: 1,600 oC   Boiling Point: ? oC   Specific Heat: 0.12 J g-1 K-1 Heat of Vaporization: ? kJ mol-1 Heat of Fusion: 12.3 kJ mol-1 Electrical Conductivity: 0.0529 106 cm-1 Ohm-1 Thermal Conductivity: 0.47 W cm-1 K-1
Chemical  Valance Number: +4,+5 Electron Configuration: 2,8,18,32,20,9,2 Electronegativity: 1.5 1st Ionization Potential: 5.9 Volts 2nd Ionization Potential: ? Volts 3rd Ionization Potential: ? Volts	Chemical Valance Number: -4,-5 Positron Configuration: 2,8,18,32,20,9,2 Positronpositivity: 1.5 1st Ionization Potential: 5.9 Volts 2nd Ionization Potential: ? Volts 3rd Ionization Potential: ? Volts
Identified by Fredrich Soddy, John Cranston,  Otto Hahn, and Lise Meitner England and France in 1917	Identified by Norm Hansen in 2001

1/ Superscript A before the element/symbol indicates the element is antimatter. 231APa is an AntiProtactinium element with an atomic mass of 231. See Rosetta Stone for Matter & Antimatter Definitions

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