ପୋଟାସିଅମ (English: Potassium) ହେଉଛି ଏକ ରାସାୟନିକ ମୌଳିକ ଯାହାର ପ୍ରତୀକ K ଓ ପରମାଣୁ କ୍ରମାଙ୍କ ୧୯ ।
Quick facts ସାଧାରଣ ଗୁଣ, ନାମ, ପ୍ରତୀକ ...
Potassium, 19K |
 Potassium pearls under paraffin oil. The large pearl measures 0.5 cm. Below: spectral lines of potassium |
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ନାମ, ପ୍ରତୀକ | potassium, K |
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Appearance | silvery gray |
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ଉଚ୍ଚାରଣ | po-TAS-ee-əm |
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ପରମାଣୁ କ୍ରମାଙ୍କ (Z) | 19 |
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ଶ୍ରେଣୀ, ବ୍ଳକ | group 1 (alkali metals), s-block |
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ପର୍ଯ୍ୟାୟ | period 4 |
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ମୌଳିକ ପ୍ରକାର | alkali metal |
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ମାନକ ପରମାଣବିକ ଓଜନ (±) (Ar) | 39.0983(1) |
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ଇଲେକ୍ଟ୍ରୋନ୍ ବିନ୍ୟାସ | [Ar] 4s1 |
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per shell | 2, 8, 8, 1 |
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ଅବସ୍ଥା | solid |
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ଗଳନାଙ୍କ | 336.53 K (63.38 °C, 146.08 °F) |
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ସ୍ଫୁଟନାଙ୍କ | 1032 K (759 °C, 1398 °F) |
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Density near r.t. | 0.862 g/cm3 |
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when liquid, at m.p. | 0.828 g/cm3 |
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Triple point | 336.35 K, kPa |
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Heat of fusion | 2.33 kJ/mol |
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Heat of | 76.9 kJ/mol |
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Molar heat capacity | 29.6 J/(mol·K) |
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Oxidation states | 1 strongly basic oxide |
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Electronegativity | Pauling scale: 0.82 |
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energies | (more) |
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Atomic radius | empirical: 227 pm |
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Covalent radius | 203±12 pm |
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Van der Waals radius | 275 pm |
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Crystal structure | body-centered cubic (bcc) |
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Speed of sound thin rod | 2000 m/s (at 20 °C) |
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Thermal expansion | 83.3 µm/(m·K) (at 25 °C) |
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Thermal conductivity | 102.5 W/(m·K) |
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Electrical resistivity | 72 n Ω·m (at 20 °C) |
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Magnetic ordering | paramagnetic |
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Young's modulus | 3.53 GPa |
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Shear modulus | 1.3 GPa |
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Bulk modulus | 3.1 GPa |
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Mohs hardness | 0.4 |
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Brinell hardness | 0.363 MPa |
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CAS Number | 7440-09-7 |
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ଆବିଷ୍କାର | Humphry Davy (1807) |
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First isolation | Humphry Davy (1807) |
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iso |
NA |
half-life |
DM |
DE (MeV) |
DP |
39K |
93.26% |
39K is stable with 20 neutrons |
40K |
0.012% |
1.248(3)×109 y |
β− |
1.311 |
40Ca |
ε |
1.505 |
40Ar |
β+ |
1.505 |
40Ar |
41K |
6.73% |
41K is stable with 22 neutrons |
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| references |
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