cerium

cerium (chemical element)

Periodic table location

Image

atomic symbol | Ce atomic number | 58 short electronic configuration | [Xe]6s^24f^15d^1 Aufbau diagram | 5d 4f 6s block | f period | 6 atomic mass | 140.116 u (unified atomic mass units)

phase at STP | solid melting point | 798 °C (rank: 61st) boiling point | 3360 °C (rank: 23rd) molar heat of fusion | 5.5 kJ/mol (rank: 68th) molar heat of vaporization | 350 kJ/mol (rank: 29th) specific heat at STP | 192 J/(kg K) (rank: 59th) Néel point | 12.5 K (properties at standard conditions)

density | 6.689 g/cm^3 (rank: 52nd) liquid density | 6.55 g/cm^3 molar volume | 20.95 cm^3/mol Mohs hardness | 2.5 (between gypsum and calcite) Vickers hardness | 270 MPa (rank: 39th) Brinell hardness | 412 MPa (rank: 35th) bulk modulus | 22 GPa (rank: 54th) shear modulus | 14 GPa Young's modulus | 34 GPa (rank: 49th) Poisson ratio | 0.24 (rank: 44th) tensile yield strength | 91 MPa (rank: 17th) ultimate tensile strength | 100 MPa (rank: 28th) sound speed | 2100 m/s (rank: 53rd) thermal expansion | 6.3×10^-6 K^(-1) (rank: 53rd) thermal conductivity | 11 W/(m K) (rank: 66th) (properties at standard conditions)

electrical type | conductor resistivity | 7.4×10^-7 Ω m (ohm meters) electrical conductivity | 1.4×10^6 S/m (siemens per meter) magnetic type | paramagnetic volume magnetic susceptibility | 0.0014716 mass magnetic susceptibility | 2.2×10^-7 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 3.0826×10^-8 m^3/mol (cubic meters per mole) Néel point | 12.5 K (kelvins) work function | 2.9 eV (Polycrystalline) threshold frequency | 7.012×10^14 Hz (hertz) superconducting point | 0.022 K (kelvins) color | (silver)

valence | 4 electronegativity | 1.12 electron affinity | 50 kJ/mol (kilojoules per mole) first ionization energy | 534.4 kJ/mol (kilojoules per mole) ionization energies | 534.4 kJ/mol | 1050 kJ/mol | 1949 kJ/mol | 3547 kJ/mol | 6325 kJ/mol | 7490 kJ/mol

Reactivity

term symbol | ^1G_4 atomic radius | 185 pm covalent radius | 204 pm (electronic ground state properties)

(neutral cerium atomic spectrum)

universe abundance | 1×10^-6 mass% (rank: 33rd) solar abundance | 4×10^-7 mass% (rank: 44th) meteorite abundance | 7.5×10^-5 mass% (rank: 43rd) crust abundance | 0.006 mass% (rank: 25th) ocean abundance | 1.2×10^-10 mass% (rank: 59th) universe molar abundance | 9×10^-9 mol% (rank: 42nd) solar molar abundance | 3×10^-9 mol% (rank: 48th) meteorite molar abundance | 1.1×10^-5 mol% (rank: 42nd) ocean molar abundance | 5.3×10^-12 mol% (rank: 72nd) crust molar abundance | 8.9×10^-4 mol% (rank: 31st)

half-life | (stable) stable isotopes | Ce-140 (88.45%) | Ce-142 (11.114%) | Ce-138 (0.251%) | Ce-136 (0.185%) nuclear spin | Ce-119: 5/2^+ | Ce-120: 0^+ | Ce-121: 5/2^+ | Ce-122: 0^+ | Ce-123: 5/2^+ | Ce-124: 0^+ | Ce-125: 5/2^+ | Ce-126: 0^+ | Ce-127: 5/2^+ | Ce-128: 0^+ | Ce-129: 5/2^+ | Ce-130: 0^+ | Ce-131: 7/2^+ | Ce-132: 0^+ | Ce-133: 1/2^+ | Ce-134: 0^+ | Ce-135: 1/2^+ | Ce-136: 0^+ | Ce-137: 3/2^+ | Ce-138: 0^+ | Ce-139: 3/2^+ | Ce-140: 0^+ | Ce-141: 7/2^- | Ce-142: 0^+ | Ce-143: 3/2^- | Ce-144: 0^+ | Ce-145: 5/2^- | Ce-146: 0^+ | Ce-147: 5/2^- | Ce-148: 0^+ | Ce-149: 3/2^- | Ce-150: 0^+ | Ce-151: 5/2^+ | Ce-152: 0^+ | Ce-153: 3/2^- | Ce-154: 0^+ | Ce-155: 5/2^- | Ce-156: 0^+ | Ce-157: 7/2^+ unstable isotopes | Ce-144 (284.91 days) | Ce-139 (137.641 days) | Ce-141 (32.508 days) | Ce-134 (75.8 h) | Ce-143 (33.0389 h) | Ce-135 (17.7 h) | Ce-137 (8.9 h) | Ce-132 (211 min) | Ce-133 (97 min) | Ce-130 (22.9 min) | Ce-146 (13.52 min) | Ce-131 (10.3 min) | Ce-128 (3.93 min) | Ce-129 (210 s) | Ce-145 (181 s) | Ce-148 (56 s) | Ce-147 (56.4 s) | Ce-126 (51 s) | Ce-127 (31 s) | Ce-125 (10.2 s) | Ce-149 (5.3 s) | Ce-124 (6 s) | Ce-150 (4 s) | Ce-123 (3.8 s) | Ce-151 (1.76 s) | Ce-122 (2 s) | Ce-152 (1.4 s) | Ce-121 (1.1 s) | Ce-120 (250 ms) | Ce-119 (200 ms) | Ce-156 (150 ms) | Ce-157 (50 ms) | Ce-155 (300 ns) | Ce-154 (150 ns) | Ce-153 (100 ns) neutron cross-section | 0.6 b neutron mass absorption | 2.1×10^-4 m^2/kg

CAS number | 7440-45-1 PubChem CID number | 23974