Properties

CAS Number7440-12-2
PubChem CIDna
Atomic Radius183
Atomic Volume22.39
Atomic Weight[145]
Blockf
Boiling Point3,000
Bulk Modulus
CategoryLanthanides
Crystal Structure
ColorSilver
Covalent Radius199
Density7.26
Electrical Resistivity
Electron Configuration[Xe] 4f5 6s2
Electrons per shell2, 8, 18, 23, 8, 2
Electronegativity-
Electrons61
Groupna
Heat of Fusion7.7
Heat of Vaporization290
Ionization Potential5.582
Magnetic Ordering
Magnetic Susceptibility
Mass[145]
Mass Number61
Melting Point1,042
NamePromethium
Neutrons84
Atomic Number145
Oxidation States3
Period6
PhaseSolid
Poisson Ratio
Protons61
Shear Modulus
Specific Heat Capacity-
SymbolPm
Thermal Conductivity0.179
Van der Waals radius
Young's Modulus
Abundance
Abundance in Earth's crustna
Abundance in Universena
Pm Promethium 61 (145) 6 f 61 1042.0 3000.0 [Xe] 4f5 6s2 2 8 18 23 8 2 7.26 None Silver Hexagonal {"1":"540","2":"1050","3":"2150","4":"3970"} 540 50 3 22.4 17.9 1 17.73 y 25.56y ElectronCapture Solid, Conductor, Lanthanide, Radioactive, Synthetic pro-MEE-thi-em Rare earth metal of synthetic origin on the earth, naturally made in stars. It has been used as a source of radioactivity for thickness-measuring gages. Does not occur naturally. Found among fission products of uranium, thorium, and plutonium. px52fxITTrw Promethium
Cadmium was discovered by German chemist Friedrich Stromeyer in 1817 as an impurity in zinc carbonate.

Stromeyer noted that some impure samples of calamine (zinc carbonate) changed color when heated but pure calamine did not.

Cadmium was independently discovered by German chemist Karl Hermann in 1818. From the Latin word cadmia, Greek kadmeia - the ancient name for calamine, zinc carbonate 61 1945 J. A. Marinsky, Lawrence Glendenin, Charles D. Coryell United States Named after "Prometheus" in Greek mythology, who stole fire from the gods

Isotopes of Cadmium

Standard Atomic Weight

[145]

Stable Isotopes

Unstable Isotopes

126Pm 127Pm 128Pm 129Pm 130Pm 131Pm 132Pm 133Pm 134Pm 135Pm 136Pm 137Pm 138Pm 139Pm 140Pm 141Pm 142Pm 143Pm 144Pm 145Pm 146Pm 147Pm 148Pm 149Pm 150Pm 151Pm 152Pm 153Pm 154Pm 155Pm 156Pm 157Pm 158Pm 159Pm 160Pm 161Pm 162Pm 163Pm

Cadmium and its compounds are highly toxic
Cadmium is a soft metal which is easily cut with a knife
Cadmium is a key component in battery production.

It is also is used in electroplating.

Cadmium oxide is used in black and white television phosphors and in the blue and green phosphors for color television picture tubes.

Cadmium is used as a barrier to control neutrons in nuclear fission.