Cerium Facts - Ce or Atomic Number 58

Cerium Facts - Ce or Atomic Number 58 Cerium (Ce) is nuclear number 58 on the intermittent table. Like different lanthanides or uncommon earth components, cerium is a delicate, silver-hued metal. Its the most copious of the uncommon earth components. Cerium Basic Facts Component Name: Cerium Nuclear Number: 58 Image: Ce Nuclear Weight: 140.115 Component Classification: Rare Earth Element (Lanthanide Series) Found By: W. von Hisinger, J. Berzelius, M. Klaproth Disclosure Date: 1803 (Sweden/Germany) Name Origin: Named after the space rock Ceres, found two years before the component. Cerium Physical Data Thickness (g/cc) close r.t.: 6.757 Dissolving Point ( °K): 1072 Breaking point ( °K): 3699 Appearance: Malleable, pliable, iron-dark metal Nuclear Radius (pm): 181 Nuclear Volume (cc/mol): 21.0 Covalent Radius (pm): 165 Ionic Radius: 92 (4e) 103.4 (3e) Explicit Heat (20 °C J/g mol): 0.205 Combination Heat (kJ/mol): 5.2 Dissipation Heat (kJ/mol): 398 Pauling Negativity Number: 1.12 First Ionizing Energy (kJ/mol): 540.1 Oxidation States: 4, 3 Electronic Configuration: [Xe] 4f1 5d1 6s2 Grid Structure: Face-Centered Cubic (FCC) Grid Constant (Ã… ): 5.160 Electrons per Shell: 2, 8, 18, 19, 9, 2 Stage: Solid Fluid Density at m.p.: 6.55 gâ ·cmâˆ'3 Warmth of Fusion: 5.46 kJ ·molâˆ'1 Warmth of Vaporization: 398 kJ ·molâˆ'1 Warmth Capacity (25  °C): 26.94 J ·molâˆ'1 ·Kâˆ'1 Electronegativity: 1.12 (Pauling scale) Nuclear Radius: 185 pm Electrical Resistivity (r.t.): (ÃŽ ², poly) 828 nî ©Ã¢ ·m Warm Conductivity (300 K): 11.3 W ·mâˆ'1 ·Kâˆ'1 Warm Expansion (r.t.): (ÃŽ ³, poly) 6.3  µm/(m ·K) Speed of Sound (slight pole) (20  °C): 2100 m/s Youngs Modulus (ÃŽ ³ structure): 33.6 GPa Shear Modulus (ÃŽ ³ structure): 13.5 GPa Mass Modulus (ÃŽ ³ structure): 21.5 GPa Poisson Ratio (ÃŽ ³ structure): 0.24 Mohs Hardness: 2.5 Vickers Hardness: 270 MPa Brinell Hardness: 412 MPa CAS Registry Number: 7440-45-1 Sources: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Langes Handbook of Chemistry (1952) Come back to the Periodic Table