Molibdeno

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Molybdenum
42Mo
Cr

Mo

W
niobiummolybdenumtechnetium
Appearance
gray metallic
General properties
Name, simbolo, kaiphan molybdenum, Mo, 42
Pronunciation Plantilya:IPAc-en Plantilya:Respell
or Plantilya:IPAc-en Plantilya:Respell
Element category puthaw nga transisyon
Group, period, block 65, d
Standard atomic weight 95.96(2)
Electron configuration [Kr] 5s1 4d5
2, 8, 18, 13, 1
Electron shells of molybdenum (2, 8, 18, 13, 1)
History
Discovery Carl Wilhelm Scheele (1778)
First isolation Peter Jacob Hjelm (1781)
Physical properties
Phase magahi
Density (near r.t.) 10.28 g·cm−3
Liquid density at m.p. 9.33 g·cm−3
Melting point 2896 K, 2623 °C, 4753 °F
Boiling point 4912 K, 4639 °C, 8382 °F
Heat of fusion 37.48 kJ·mol−1
Heat of vaporization 598 kJ·mol−1
Molar heat capacity 24.06 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 2742 2994 3312 3707 4212 4879
Atomic properties
Oxidation states 6, 5, 4, 3, 2, 1[1], -1, -2
(strongly acidic oxide)
Electronegativity 2.16 (Pauling scale)
Ionization energies 1st: 684.3 kJ·mol−1
2nd: 1560 kJ·mol−1
3rd: 2618 kJ·mol−1
Atomic radius 139 pm
Covalent radius 154±5 pm
Miscellanea
Crystal structure body-centered cubic
Molybdenum has a body-centered cubic crystal structure
Magnetic ordering paramagnetic[2]
Electrical resistivity (20 °C) 53.4 nΩ·m
Thermal conductivity 138 W·m−1·K−1
Thermal diffusivity (300 K) 54.3[3] mm²/s
Thermal expansion (25 °C) 4.8 µm·m−1·K−1
Speed of sound (thin rod) (r.t.) 5400 m·s−1
Young's modulus 329 GPa
Shear modulus 126 GPa
Bulk modulus 230 GPa
Poisson ratio 0.31
Mohs hardness 5.5
Vickers hardness 1530 MPa
Brinell hardness 1500 MPa
CAS registry number 7439-98-7
Most stable isotopes
Main article: Isotopes of molybdenum
iso NA half-life DM DE (MeV) DP
92Mo 14.84% >1.9×1020 y β+β+ 1.6491 92Zr
93Mo syn 4×103 y ε - 93Nb
94Mo 9.25% 94Mo is stable with 52 neutrons
95Mo 15.92% 95Mo is stable with 53 neutrons
96Mo 16.68% 96Mo is stable with 54 neutrons
97Mo 9.55% 97Mo is stable with 55 neutrons
98Mo 24.13% >1×1014 y ββ 0.1125 98Ru
99Mo syn 65.94 h β 0.436, 1.214 99mTc
γ 0.74, 0.36,
0.14
-
100Mo 9.63% 7.8×1018 y ββ 3.04 100Ru
t  h  u
· r

Ang molibdeno (Iningles molybdenum) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Mo ug kaiphan nga atomik 42. Ang molibdeno mao ang puthaw nga transisyon.

Ang mga gi basihan niini[usba | edit source]

  1. Molybdenum: molybdenum(I) fluoride compound data. OpenMOPAC.net. Retrieved on 2007-12-10.
  2. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.
  3. Plantilya:Cite conference


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