د ويکيپېډيا، وړیا پوهنغونډ له خوا
Technetium, 43Tc |
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| Pronunciation | /tɛkˈniːʃiəm/
tek-NEE-shee-əm |
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| Appearance | shiny gray metal |
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| اټومي شمیره (Z) | 43 |
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| گروپ, پیریود | group 7, period 5 |
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| بلاک | d-block |
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| Element category | transition metal |
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| Mass number | 98 (most stable isotope) |
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| Electron configuration | [Kr] 4d5 5s2 |
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Electrons per shell | 2, 8, 18, 13, 2 |
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| حالت (at STP) | جامد |
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| دويلې کيدو ټکى | 2430 K (2157 °C, 3915 °F) |
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| يشنا ټکی | 4538 K (4265 °C, 7709 °F) |
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| Density near r.t. | 11 g/cm3 |
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| Heat of fusion | 33.29 kJ/mol |
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| Heat of vaporization | 585.2 kJ/mol |
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| Molar heat capacity | 24.27 J/(mol·K) |
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Vapor pressure (extrapolated)
| P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
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| at T (K)
|
2727
|
2998
|
3324
|
3726
|
4234
|
4894
| |
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| Oxidation states | 7, 6, 5, 4, 3,[۱] 2, 1,[۱] −1, −3 (a strongly acidic oxide) |
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| Electronegativity | Pauling scale: 1.9 |
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| Ionization energies | - 1st: 702 kJ/mol
- 2nd: 1470 kJ/mol
- 3rd: 2850 kJ/mol
-
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| Atomic radius | empirical: 136 pm |
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| Covalent radius | 147±7 pm |
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| Crystal structure | hexagonal close-packed (hcp) Hexagonal close packed crystal structure for technetium |
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| Speed of sound thin rod | 16,200 m/s (at 20 °C) |
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| Thermal expansion | 7.1 µm/(m·K)[۲] (at r.t.) |
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| د تودوخې تېرېدنه | 50.6 W/(m·K) |
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| Electrical resistivity | 200 nΩ·m (at 20 °C) |
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| Magnetic ordering | Paramagnetic |
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| Magnetic susceptibility (χmol) | +270.0·10−6 cm3/mol (298 K)[۳] |
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| CAS Number | 7440-26-8 |
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| Prediction | Dmitri Mendeleev (1871) |
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| Discovery and first isolation | Emilio Segrè and Carlo Perrier (1937) |
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| | references | in Wikidata |
Element navigation
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د سرچينو همدا لړليک په ليکنه کې نه ښکاري.
کينډۍ لاسوند[جوړول]