praseodymium

praseodymium (chemical element)

Periodic table location

Image

atomic symbol | Pr atomic number | 59 short electronic configuration | [Xe]6s^24f^3 Aufbau diagram | 4f 6s block | f period | 6 atomic mass | 140.90766 u (unified atomic mass units)

phase at STP | solid melting point | 931 °C (rank: 51st) boiling point | 3290 °C (rank: 25th) molar heat of fusion | 6.9 kJ/mol (rank: 62nd) molar heat of vaporization | 330 kJ/mol (rank: 34th) specific heat at STP | 193 J/(kg K) (rank: 58th) (properties at standard conditions)

density | 6.64 g/cm^3 (rank: 53rd) liquid density | 6.5 g/cm^3 molar volume | 21.22 cm^3/mol Mohs hardness | 1.4 (between talc and gypsum) Vickers hardness | 400 MPa (rank: 35th) Brinell hardness | 481 MPa (rank: 32nd) bulk modulus | 29 GPa (rank: 51st) shear modulus | 15 GPa Young's modulus | 37 GPa (rank: 47th) Poisson ratio | 0.28 (rank: 27th) tensile yield strength | 100 MPa (rank: 16th) ultimate tensile strength | 110 MPa (rank: 27th) sound speed | 2280 m/s (rank: 49th) thermal expansion | 6.7×10^-6 K^(-1) (rank: 50th) thermal conductivity | 13 W/(m K) (rank: 62nd) (properties at standard conditions)

electrical type | conductor resistivity | 7×10^-7 Ω m (ohm meters) electrical conductivity | 1.4×10^6 S/m (siemens per meter) magnetic type | paramagnetic volume magnetic susceptibility | 0.0028087 mass magnetic susceptibility | 4.23×10^-7 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 5.9604×10^-8 m^3/mol (cubic meters per mole) color | (silver)

valence | 4 electronegativity | 1.13 electron affinity | 50 kJ/mol (kilojoules per mole) first ionization energy | 527 kJ/mol (kilojoules per mole) ionization energies | 527 kJ/mol | 1020 kJ/mol | 2086 kJ/mol | 3761 kJ/mol | 5551 kJ/mol

Reactivity

term symbol | ^4I_(9/2) atomic radius | 185 pm covalent radius | 203 pm (electronic ground state properties)

(neutral praseodymium atomic spectrum)

universe abundance | 2×10^-7 mass% (rank: 51st) solar abundance | 1×10^-7 mass% (rank: 57th) meteorite abundance | 9.8×10^-6 mass% (rank: 65th) crust abundance | 8.6×10^-4 mass% (rank: 37th) ocean abundance | 6×10^-11 mass% (rank: 68th) universe molar abundance | 2×10^-9 mol% (rank: 52nd) solar molar abundance | 5×10^-10 mol% (rank: 68th) meteorite molar abundance | 1×10^-6 mol% (rank: 65th) ocean molar abundance | 2.6×10^-12 mol% (rank: 80th) crust molar abundance | 1.3×10^-4 mol% (rank: 38th)

half-life | (stable) stable isotopes | Pr-141 (100%) nuclear spin | Pr-121: 3/2^- | Pr-123: 3/2^+ | Pr-125: 3/2^+ | Pr-126: 4^? | Pr-127: 3/2^+ | Pr-129: 11/2^- | Pr-131: 3/2^+ | Pr-132: 2^+ | Pr-133: 3/2^+ | Pr-134: 5^- | Pr-135: 3/2^+ | Pr-136: 2^+ | Pr-137: 5/2^+ | Pr-138: 1^+ | Pr-139: 5/2^+ | Pr-140: 1^+ | Pr-141: 5/2^+ | Pr-142: 2^- | Pr-143: 7/2^+ | Pr-144: 0^- | Pr-145: 7/2^+ | Pr-146: 2^- | Pr-147: 3/2^+ | Pr-148: 1^- | Pr-149: 5/2^+ | Pr-150: 1^- | Pr-151: 3/2^- | Pr-152: 4^- | Pr-153: 5/2^- | Pr-155: 5/2^- | Pr-157: 5/2^- | Pr-159: 5/2^- unstable isotopes | Pr-143 (13.57 days) | Pr-142 (19.119 h) | Pr-145 (5.9833 h) | Pr-139 (4.42 h) | Pr-137 (76.83 min) | Pr-146 (24.15 min) | Pr-135 (24 min) | Pr-144 (17.28 min) | Pr-147 (13.4 min) | Pr-136 (13.1 min) | Pr-134 (11 min) | Pr-133 (6.5 min) | Pr-140 (203 s) | Pr-148 (137 s) | Pr-149 (136 s) | Pr-132 (96 s) | Pr-131 (90 s) | Pr-138 (87 s) | Pr-130 (40 s) | Pr-129 (32 s) | Pr-151 (18.9 s) | Pr-150 (6.19 s) | Pr-153 (4.28 s) | Pr-127 (4.2 s) | Pr-152 (3.63 s) | Pr-125 (3.3 s) | Pr-126 (3.14 s) | Pr-128 (2.84 s) | Pr-154 (2.3 s) | Pr-121 (1.4 s) | Pr-124 (1.2 s) | Pr-123 (800 ms) | Pr-122 (500 ms) | Pr-157 (300 ms) | Pr-158 (200 ms) | Pr-159 (100 ms) | Pr-156 (300 ns) | Pr-155 (300 ns) neutron cross-section | 11.4 b neutron mass absorption | 0.0029 m^2/kg

CAS number | 7440-10-0 PubChem CID number | 23942