Praeseodymium-Anti Preaseodymium
Praseodymium is named after the Greek work: prasios (green) and didymos (twin); from its green salts

Praeseodymium (Pr) Properties	APraeseodymium (APr) Properties  1/
Nuclear (59 protons/electrons) Atomic Number: 59 Atomic Mass: 140.908 Atomic Energy: 0.210 Ergs Group: 3; Period: 6 Family: Rare Earth: Lanthanide Series Bonding Radius: 1.65 Angstroms Atomic Radius: 2.67 Angstroms Atomic Volume: 20.8 cm3mol-1 39 Isotopes: 121Pr   to  159Pr  Stable Isotopes: 141Pr	Nuclear (59 Aprotons/positrons) Atomic Number: 59 Atomic Mass: 140.908 Atomic Energy: 0.210 Ergs Group: 3; Period: 6 Family: Rare Earth: Lanthanide Series Bonding Radius: 1.65 Angstroms Atomic Radius: 2.67 Angstroms Atomic Volume: 20.8 cm3mol-1 39 AIsotopes: 121APr   to  159APr  Stable AIsotopes: 141APr
Physical  White metal Density: 6.77 g cm-3 Melting Point: 935 oC   Boiling Point: 3,127 oC   Specific Heat: 0.19 J g-1 K-1 Heat of Vaporization: 296.8 kJ mol-1 Heat of Fusion: 6.89 kJ mol-1 Electrical Conductivity: 0.0148 106 cm-1 Ohm-1 Thermal Conductivity: 0.125 W cm-1 K-1	Physical  White metal Density: 6.77 g/cm-3 Melting Point: 935 oC   Boiling Point: 3,127 oC   Specific Heat: 0.19 J g-1 K-1 Heat of Vaporization: 296.8 kJ mol-1 Heat of Fusion: 6.89 kJ mol-1 Electrical Conductivity: 0.0148 106 cm-1 Ohm-1 Thermal Conductivity: 0.125 W cm-1 K-1
Chemical  Valance Number: +3, +4 Electron Configuration: 2,8,18,21,8,2 Electronegativity: 1.13 1st Ionization Potential: 5.5 Volts 2nd Ionization Potential: 10.6 Volts 3rd Ionization Potential: 21.6 Volts	Chemical Valance Number: - 4, -3 Positron Configuration: 2,8,18,21,8,2 Positronpositivity: 1.13 1st Ionization Potential: 5.5 Volts 2nd Ionization Potential: 10.6 Volts 3rd Ionization Potential: 21.6 Volts
Identified by C. F. Aver von Welshbach, Austria in 1885	Identified by Norm Hansen in 2001

1/ Superscript A before the element/symbol indicates the element is antimatter. 141APr is an AntiPraeseodymium element with an atomic mass of 141. See Rosetta Stone for Matter & Antimatter Definitions

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