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ନାମ, ପ୍ରତୀକ | rubidium, Rb |
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Appearance | grey white |
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ଉଚ୍ଚାରଣ | roo-BID-ee-əm |
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ପରମାଣୁ କ୍ରମାଙ୍କ (Z) | 37 |
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ଶ୍ରେଣୀ, ବ୍ଳକ | group 1 (alkali metals), s-block |
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ପର୍ଯ୍ୟାୟ | period 5 |
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ମୌଳିକ ପ୍ରକାର | alkali metal |
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ମାନକ ପରମାଣବିକ ଓଜନ (±) (Ar) | 85.4678(3) |
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ଇଲେକ୍ଟ୍ରୋନ୍ ବିନ୍ୟାସ | [Kr] 5s1 |
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per shell | 2, 8, 18, 8, 1 |
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ଅବସ୍ଥା | solid |
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ଗଳନାଙ୍କ | 312.46 K (39.31 °C, 102.76 °F) |
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ସ୍ଫୁଟନାଙ୍କ | 961 K (688 °C, 1270 °F) |
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Density near r.t. | 1.532 g/cm3 |
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when liquid, at m.p. | 1.46 g/cm3 |
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Critical point | (extrapolated) 2093 K, 16 MPa |
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Heat of fusion | 2.19 kJ/mol |
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Heat of | 75.77 kJ/mol |
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Molar heat capacity | 31.060 J/(mol·K) |
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pressure
P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
|
at T (K)
|
434
|
486
|
552
|
641
|
769
|
958
| |
|
Oxidation states | 1 (strongly basic oxide) |
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Electronegativity | Pauling scale: 0.82 |
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Atomic radius | empirical: 248 pm |
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Covalent radius | 220±9 pm |
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Van der Waals radius | 303 pm |
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Crystal structure | body-centered cubic (bcc) |
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Speed of sound thin rod | 1300 m/s (at 20 °C) |
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Thermal conductivity | 58.2 W/(m·K) |
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Electrical resistivity | 128 n Ω·m (at 20 °C) |
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Magnetic ordering | paramagnetic[୧] |
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Young's modulus | 2.4 GPa |
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Bulk modulus | 2.5 GPa |
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Mohs hardness | 0.3 |
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Brinell hardness | 0.216 MPa |
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CAS Number | 7440-17-7 |
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ଆବିଷ୍କାର | Robert Bunsen and Gustav Kirchhoff (1861) |
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First isolation | George de Hevesy |
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| references |