موليبډينوم (په انگرېزي : Molybdenum ) له کیمیاوي عناصرو څخه یو دی چې په تناوبي جدول کې د Mo سمبول او ۴۲ اتمي شمېرې په وسیله ښودل شوی دی.
Molybdenum, 42 Mo Pronunciation / ˌ m ɒ l ɪ b ˈ d iː n əm / or / m ə ˈ l ɪ b d ɪ n əm / MOL -ib-DEE -nəm or MƏ -LIB-DIN -əmAppearance gray metallic اټومي شمیره (Z ) 42 گروپ , پیریود group 6 , period 5 بلاک d-block Element category transition metal معياري اټومي وزن (A r ) کينډۍ:Val [۱] Electron configuration [Kr ] 4d5 5s1 Electrons per shell
2, 8, 18, 13, 1 حالت (at STP ) جامد دويلې کيدو ټکى 2896 K (2623 °C, 4753 °F) يشنا ټکی 4912 K (4639 °C, 8382 °F) Density near r.t. 10.28 g/cm3 when liquid, at m.p. 9.33 g/cm3 Heat of fusion 37.48 kJ/mol Heat of vaporization 598 kJ/mol Molar heat capacity 24.06 J/(mol·K) Vapor pressure
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
2742
2994
3312
3707
4212
4879
Oxidation states 6 , 5, 4 , 3, 2, 1,[۲] −1, −2, −4 (a strongly acidic oxide)Electronegativity Pauling scale: 2.16 Ionization energies 1st: 684.3 kJ/mol 2nd: 1560 kJ/mol 3rd: 2618 kJ/mol Atomic radius empirical: 139 pm Covalent radius 154±5 pm Crystal structure body-centered cubic (bcc)Body-centered cubic crystal structure for molybdenum Speed of sound thin rod 5400 m/s (at r.t. ) Thermal expansion 4.8 µm/(m·K) (at 25 °C) د تودوخې تېرېدنه 138 W/(m·K) Thermal diffusivity 54.3 mm2 /s (at 300 K)[۳] Electrical resistivity 53.4 nΩ·m (at 20 °C) Magnetic ordering paramagnetic [۴] Magnetic susceptibility (χ mol ) +89.0·10−6 cm3 /mol (298 K)[۵] Young's modulus 329 GPa Shear modulus 126 GPa Bulk modulus 230 GPa Poisson ratio 0.31 Mohs hardness 5.5 Vickers hardness 1400–2740 MPa Brinell hardness 1370–2500 MPa CAS Number 7439-98-7 Discovery Carl Wilhelm Scheele (1778) First isolation Peter Jacob Hjelm (1781)
| references | in Wikidata
د استعمال ځایونه
سمول