
Molybdenum (Mo) is a chemical element of the periodic table, located in the group 6 and the period 5, and has the atomic number 42. It is a hard, silvery-white transition metal, whose name comes from the Greek word “molybdos”, which means lead.
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– d block |
FAQs on Molybdenum Element
Molybdenum |
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‣ What does molybdenum look like? Appearance: grey metallic |
‣ Who discovered molybdenum? When was molybdenum discovered? Discovery: Carl Wilhelm Scheele (1778) First isolation: Peter Jacob Hjelm (1781) |
‣ Where is molybdenum found on the periodic table?![]() Location: Molybdenum is found in the sixth column of the periodic table, next to the niobium element. |
‣ What is the atomic number of molybdenum? Atomic number (Z): 42 |
‣ What is the symbol of molybdenum? Symbol: Mo |
‣ What is the atomic weight of molybdenum? Standard atomic weight: 95.95 |
‣ What block does molybdenum belong to? Block: d-block |
‣ What group does molybdenum belong to? Group: 6 |
‣ What period is molybdenum in on the periodic table? Period: 5 |
‣ What is the atomic radius of molybdenum? Atomic radius: empirical: 139 pm |
‣ Molybdenum covalent radius: 154±5 pm |
‣ What is the melting point of molybdenum? Melting point: 2896 K (2623 °C, 4753 °F) |
‣ What is molybdenum boiling point? Boiling point: 4912 K (4693 °C, 8382 °F) |
‣ How many electron shells does molybdenum have? Electrons per shell: 2, 8, 18, 13, 1 |
‣ Which is the correct electron configuration for the element molybdenum (mo)? Electron configuration: [Kr] 4d5 5s1 |
‣ Molybdenum ionization energies: 1st: 684.3 kJ/mol 2nd: 1560 kJ/mol 3rd: 2618 kJ/mol |
‣ What phase is molybdenum normally found in? Phase (at r.t): solid |
‣ What is the density of molybdenum? Density (near r.t): 10.28 g/cm3 when liquid (at m.p): 9.33 g/cm3 |
‣ Molybdenum magnetic ordering: paramagnetic |
‣ Molybdenum natural occurrence: primordial |
‣ What is molybdenum oxidation state? Oxidation state: +2, +3, +4, +5, +6 |
‣ What’s the electronegativity of molybdenum? Electronegativity: Pauling scale: 2.16 |
‣ Molybdenum poisson’s ratio: 0.31 |
‣ Molybdenum heat of fusion: 37.48 kJ/mol |
‣ Molybdenum heat of vaporization: 598 kJ/mol |
‣ Molybdenum molar heat capacity: 24.06 J/(mol K) |
‣ Molybdenum molar magnetic susceptibility: +89.0 × 10-6 cm3/mol (298 K) |
‣ Speed of sound in molybdenum: 5400 m/s (at r.t) |
‣ What is the crystal structure of molybdenum? Crystal structure: body-centered cubic (bcc) |
‣ Thermal expansion of molybdenum: 4.8 µm/(m.K) (at 25 °C) |
‣ Thermal conductivity of molybdenum: 138 W/(m.K) |
‣ Molybdenum thermal diffusivity: 54.3 mm2/s (at 300 K) |
‣ Molybdenum electrical resistivity: 53.4 nΩ.m (at 20 °C) |
‣ Molybdenum hardness Mohs hardness: 5.5 Vickers hardness: 1400-2740 MPa Brinell hardness: 1370-2500 MPa |
‣ Young’s modulus of molybdenum: 329 GPa |
‣ Shear modulus of molybdenum: 126 GPa |
‣ Bulk modulus of molybdenum: 230 GPa |
‣ Molybdenum CAS number: 7439-98-7 |
‣ Molybdenum vapor pressure
Vapor pressure | ||||||
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P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
at T (K) | 2742 | 2994 | 3312 | 3707 | 4212 | 4879 |
‣ How many isotopes does molybdenum have?
Main isotopes of molybdenum | ||||
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
92Mo | 14.65 % | stable | ||
93Mo | syn | 4 × 103 y | ε | 93Nb |
94Mo | 9.19 % | stable | ||
95Mo | 15.87 % | stable | ||
96Mo | 16.67 % | stable | ||
97Mo | 9.58 % | stable | ||
98Mo | 24.29 % | stable | ||
99Mo | syn | 65.94 h | β– γ | 99Tc – |
100Mo | 9.74 % | 7.8 × 1018 y | β–β– | 100Ru |
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