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Spectral lines of krypton |
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ନାମ, ପ୍ରତୀକ | krypton, Kr |
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Appearance | colorless gas, exhibiting a whitish glow in a high electric field |
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ଉଚ୍ଚାରଣ | KRIP-ton |
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|
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ପରମାଣୁ କ୍ରମାଙ୍କ (Z) | 36 |
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ଶ୍ରେଣୀ, ବ୍ଳକ | group 18 (noble gases), p-block |
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ପର୍ଯ୍ୟାୟ | period 4 |
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ମୌଳିକ ପ୍ରକାର | noble gas |
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ମାନକ ପରମାଣବିକ ଓଜନ (Ar) | 83.798 |
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ଇଲେକ୍ଟ୍ରୋନ୍ ବିନ୍ୟାସ | [Ar] 3d10 4s2 4p6 |
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per shell | 2, 8, 18, 8 |
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ଅବସ୍ଥା | gas |
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ଗଳନାଙ୍କ | 115.79 K (-157.36 °C, -251.25 °F) |
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ସ୍ଫୁଟନାଙ୍କ | 119.93 K (-153.22 °C, -244.12 °F) |
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ଘନତା at stp (0 °C and 101.325 kPa) | 3.749 g/L |
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when liquid, at b.p. | 2.413[1] g/cm3 |
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Triple point | 115.775 K, 73.2 kPa [2] |
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Critical point | 209.41 K, 5.50 MPa |
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Heat of fusion | 1.64 kJ/mol |
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Heat of | 9.08 kJ/mol |
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Molar heat capacity | 5R/2 = 20.786 J/(mol·K) |
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pressure
P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
at T (K) |
59 |
65 |
74 |
84 |
99 |
120 |
|
|
Oxidation states | 2, 1, 0 |
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Electronegativity | Pauling scale: 3.00 |
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Covalent radius | 116±4 pm |
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Van der Waals radius | 202 pm |
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Crystal structure | face-centered cubic (fcc) |
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Speed of sound | (gas, 23 °C) 220, (liquid) 1120 m/s |
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Thermal conductivity | 9.43×10-3 W/(m·K) |
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Magnetic ordering | diamagnetic[3] |
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CAS Number | 7439-90-9 |
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|
ଆବିଷ୍କାର | William Ramsay and Morris Travers (1898) |
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First isolation | William Ramsay and Morris Travers (1898) |
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|
iso |
NA |
half-life |
DM |
DE (MeV) |
DP |
78Kr |
0.35% |
>1.1×1020 y |
β+β+ |
2.846 |
78Se |
79Kr |
syn |
35.04 h |
ε |
- |
79Br |
β+ |
0.604 |
79Br |
γ |
0.26, 0.39, 0.60 |
- |
80Kr |
2.25% |
80Kr is stable with 44 neutrons |
81Kr |
trace |
2.29×105 y |
ε |
- |
81Br |
γ |
0.281 |
- |
82Kr |
11.6% |
82Kr is stable with 46 neutrons |
83Kr |
11.5% |
83Kr is stable with 47 neutrons |
84Kr |
57.0% |
84Kr is stable with 48 neutrons |
85Kr |
syn |
10.756 y |
β− |
0.687 |
85Rb |
86Kr |
17.3% |
86Kr is stable with 50 neutrons |
|
| references |