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Molybdenum (Mo)
Atomic number: 42 · Category: transition metal · Group 6 · Period 5 · Phase: Solid
Molybdenum is a chemical element with symbol Mo and atomic number 42. The name is from Neo-Latin molybdaenum, from Ancient Greek Μόλυβδος molybdos, meaning lead, since its ores were confused with lead ores. Molybdenum minerals have been known throughout history, but the element was discovered (in the sense of differentiating it as a new entity from the mineral salts of other metals) in 1778 by Carl Wilhelm Scheele.
Atomic mass: 95.951
Density: 10.28
Melting point: 2896 K
Boiling point: 4912 K
Appearance: gray metallic
Source: Wikipedia
Block: d
Molar heat: 24.06
CPK color:#54b5b5
Electronic structure
Electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d5
Configuration (semantic): [Kr] 4d5 5s1
Shells: 2, 8, 18, 13, 1
Electronegativity (Pauling): 2.16
Electron affinity: 72.1
Ionization energies: 684.3, 1560, 2618, 4480, 5257, 6640.8, 12125, 13860, 15835, 17980, 20190, 22219, 26930, 29196, 52490, 55000, 61400, 67700, 74000, 80400, 87000, 93400, 98420, 104400, 121900, 127700, 133800, 139800, 148100, 154500
Periodic position
Group: 6
Period: 5
xpos: 6
ypos: 5
Spectral/Bohr images
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3D Model