praseodymium vs lanthanum

praseodymium (chemical element) | lanthanum (chemical element)

Periodic table location

Images

| praseodymium | lanthanum atomic symbol | Pr | La atomic number | 59 | 57 short electronic configuration | [Xe]6s^24f^3 | [Xe]6s^25d^1 Aufbau diagram | 4f 6s | 5d 6s block | f | f period | 6 | 6 atomic mass | 140.90766 u | 138.90547 u half-life | (stable) | (stable)

| praseodymium | lanthanum phase at STP | solid | solid melting point | 931 °C | 920 °C boiling point | 3290 °C | 3464 °C molar heat of fusion | 6.9 kJ/mol | 6.2 kJ/mol molar heat of vaporization | 330 kJ/mol | 400 kJ/mol specific heat at STP | 193 J/(kg K) | 195 J/(kg K) (properties at standard conditions)

| praseodymium | lanthanum density | 6.64 g/cm^3 | 6.146 g/cm^3 liquid density | 6.5 g/cm^3 | 5.94 g/cm^3 molar volume | 21.22 cm^3/mol | 22.6 cm^3/mol Mohs hardness | 1.4 (between talc and gypsum) | 2.5 (between gypsum and calcite) Vickers hardness | 400 MPa | 491 MPa Brinell hardness | 481 MPa | 363 MPa bulk modulus | 29 GPa | 28 GPa shear modulus | 15 GPa | 14 GPa Young's modulus | 37 GPa | 37 GPa Poisson ratio | 0.28 | 0.28 tensile yield strength | 100 MPa | 125 MPa ultimate tensile strength | 110 MPa | 130 MPa sound speed | 2280 m/s | 2475 m/s thermal expansion | 6.7×10^-6 K^(-1) | 1.21×10^-5 K^(-1) thermal conductivity | 13 W/(m K) | 13 W/(m K) (properties at standard conditions)

| praseodymium | lanthanum electrical type | conductor | conductor resistivity | 7×10^-7 Ω m (ohm meters) | 6.1×10^-7 Ω m (ohm meters) electrical conductivity | 1.4×10^6 S/m (siemens per meter) | 1.6×10^6 S/m (siemens per meter) magnetic type | paramagnetic | paramagnetic volume magnetic susceptibility | 0.0028087 | 6.761×10^-5 mass magnetic susceptibility | 4.23×10^-7 m^3/kg (cubic meters per kilogram) | 1.1×10^-8 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 5.9604×10^-8 m^3/mol (cubic meters per mole) | 1.528×10^-9 m^3/mol (cubic meters per mole) work function | | 3.5 eV (Polycrystalline) threshold frequency | | 8.463×10^14 Hz (hertz) superconducting point | | 4.88 K (kelvins) color | (silver) | (silver)

| praseodymium | lanthanum valence | 4 | 3 electronegativity | 1.13 | 1.1 electron affinity | 50 kJ/mol (kilojoules per mole) | 48 kJ/mol (kilojoules per mole) first ionization energy | 527 kJ/mol (kilojoules per mole) | 538.1 kJ/mol (kilojoules per mole) ionization energies | 527 kJ/mol | 1020 kJ/mol | 2086 kJ/mol | 3761 kJ/mol | 5551 kJ/mol | 538.1 kJ/mol | 1067 kJ/mol | 1850.3 kJ/mol | 4819 kJ/mol | 5940 kJ/mol

Reactivity

| praseodymium | lanthanum term symbol | ^4I_(9/2) | ^2D_(3/2) atomic radius | 185 pm | 195 pm covalent radius | 203 pm | 207 pm (electronic ground state properties)

| praseodymium | lanthanum universe abundance | 2×10^-7 mass% | 2×10^-7 mass% solar abundance | 1×10^-7 mass% | 2×10^-7 mass% meteorite abundance | 9.8×10^-6 mass% | 2.8×10^-5 mass% crust abundance | 8.6×10^-4 mass% | 0.0034 mass% ocean abundance | 6×10^-11 mass% | 3.4×10^-10 mass% universe molar abundance | 2×10^-9 mol% | 2×10^-9 mol% solar molar abundance | 5×10^-10 mol% | 9.9×10^-10 mol% meteorite molar abundance | 1×10^-6 mol% | 4×10^-6 mol% ocean molar abundance | 2.6×10^-12 mol% | 1.5×10^-11 mol% crust molar abundance | 1.3×10^-4 mol% | 5×10^-4 mol%

| praseodymium | lanthanum half-life | (stable) | (stable) stable isotopes | Pr-141 (100%) | La-139 (99.91%) 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^- | La-119: 11/2^- | La-121: 11/2^- | La-123: 11/2^- | La-125: 11/2^- | La-126: 5^+ | La-127: 11/2^- | La-128: 5^+ | La-129: 3/2^+ | La-130: 3^+ | La-131: 3/2^+ | La-132: 2^- | La-133: 5/2^+ | La-134: 1^+ | La-135: 5/2^+ | La-136: 1^+ | La-137: 7/2^+ | La-138: 5^+ | La-139: 7/2^+ | La-140: 3^- | La-141: 7/2^+ | La-142: 2^- | La-143: 7/2^+ | La-144: 3^- | La-145: 5/2^+ | La-146: 2^- | La-147: 5/2^+ | La-148: 2^- | La-149: 3/2^- | La-150: 3^- | La-151: 5/2^+ | La-153: 5/2^+ | La-155: 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) | La-138 (102 billion yr) | La-137 (60000 yr) | La-140 (40.2852 h) | La-135 (19.5 h) | La-132 (4.7 h) | La-141 (3.92 h) | La-133 (3.9111 h) | La-142 (91.17 min) | La-131 (58 min) | La-143 (14.2 min) | La-129 (11.6 min) | La-136 (9.87 min) | La-130 (8.67 min) | La-134 (6.45 min) | La-128 (5.18 min) | La-127 (5.17 min) | La-125 (64.8 s) | La-126 (54 s) | La-144 (40.8 s) | La-124 (29.21 s) | La-145 (24.8 s) | La-123 (17 s) | La-122 (8.7 s) | La-146 (6.27 s) | La-121 (5.3 s) | La-147 (4.015 s) | La-120 (2.8 s) | La-119 (2 s) | La-148 (1.26 s) | La-149 (1.05 s) | La-118 (1 s) | La-150 (510 ms) | La-154 (100 ms) | La-155 (60 ms) | La-117 (23.5 ms) | La-151 (300 ns) | La-152 (150 ns) | La-153 (100 ns) neutron cross-section | 11.4 b | 8.98 b neutron mass absorption | 0.0029 m^2/kg | 0.0023 m^2/kg