![Template:Infobox element/symbol-to-top-image/alt](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Xenon_discharge_tube.jpg/220px-Xenon_discharge_tube.jpg) A xenon-filled dischairge tube glowin licht blue |
Xenon |
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Pronunciation | |
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Appearance | colourless gas, exhibitin a blue glow when placed in a heich voltage electric field |
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Standard atomic weight Ar, std(Xe) | 7002131293000000000♠131.293(6)[3] |
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Xenon in the periodic cairt |
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Atomic nummer (Z) | 54 |
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Group | group 18 (noble gases) |
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Period | period 5 |
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Block | p-block |
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Element category | Noble gas |
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Electron confeeguration | [Kr] 4d10 5s2 5p6 |
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Electrons per shell | 2, 8, 18, 18, 8 |
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Pheesical properties |
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Phase at STP | gas |
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Meltin pynt | 161.40 K (-111.75 °C, -169.15 °F) |
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Bylin pynt | 165.051 K (-108.099 °C, -162.578 °F) |
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Density (at STP) | 5.894 g/L |
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whan liquid (at b.p.) | 3.057[4] g/cm3 |
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Treeple pynt | 161.405 K, 81.77[5] kPa |
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Creetical pynt | 289.733 K, 5.842[5] MPa |
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Heat o fusion | 2.27 kJ/mol |
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Heat o vapourisation | 12.64 kJ/mol |
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Molar heat capacity | 5R/2 = 20.786 J/(mol·K) |
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Vapour pressur
P (Pa)
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1
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10
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100
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1 k
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10 k
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100 k
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at T (K)
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83
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92
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103
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117
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137
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165
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Atomic properties |
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Oxidation states | 0, +1, +2, +4, +6, +8 rarely non-0, waikly acidic |
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Electronegativity | Pauling scale: 2.6 |
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Covalent radius | 140±9 pm |
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Van der Waals radius | 216 pm |
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Colour lines in a spectral rangeSpectral lines o xenon |
Ither properties |
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Naitural occurrence | primordial |
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Creestal structur | face-centred cubic (fcc) |
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Speed o soond | (liquid) 1090 m/s; (gas) 169 m/s |
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Thermal conductivity | 5.65×10-3 W/(m·K) |
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Magnetic orderin | diamagnetic[6] |
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CAS Nummer | 7440-63-3 |
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History |
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Diskivery | William Ramsay an Morris Travers (1898) |
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First isolation | William Ramsay an Morris Travers (1898) |
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Main isotopes o xenon |
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Isotope
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Abundance
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Hauf-life (t1/2)
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Decay mode
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Product
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124Xe
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0.095%
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>4.8×1016 y
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(β+β+)
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124Te
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125Xe
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syn
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16.9 h
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ε
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125I
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126Xe
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0.089%
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-
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(β+β+)
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126Te
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127Xe
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syn
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36.345 d
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ε
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127I
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128Xe
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1.91%
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-
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(SF)
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129Xe
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26.4%
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-
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(SF)
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130Xe
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4.07%
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-
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(SF)
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131Xe
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21.2%
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-
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(SF)
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132Xe
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26.9%
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-
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(SF)
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133Xe
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syn
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5.247 d
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β−
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133Cs
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134Xe
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10.4%
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>1.1×1016 y
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(β−β−)
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134Ba
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135Xe
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syn
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9.14 h
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β−
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135Cs
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136Xe
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8.86%
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2.11×1021 y[7]
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β−β−
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136Ba
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Decay modes in parentheses are predictit, but hae nae yet been observed |
| references |