Radon |
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Pronunciation | (RAY-don) |
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Appearance | colourless gas |
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Mass number | [222] |
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Radon in the periodic cairt |
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Xe ↑ Rn ↓ Uuo |
astatine ← radon → francium |
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Atomic nummer (Z) | 86 |
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Group | group 18 (noble gases) |
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Period | period 6 |
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Block | p-block |
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Element category | Noble gas |
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Electron confeeguration | [Xe] 4f14 5d10 6s2 6p6 |
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Electrons per shell | 2, 8, 18, 32, 18, 8 |
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Pheesical properties |
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Phase at STP | gas |
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Meltin pynt | 202 K (−71 °C, −96 °F) |
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Bylin pynt | 211.5 K (−61.7 °C, −79.1 °F) |
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Density (at STP) | 9.73 g/L |
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whan liquid (at b.p.) | 4.4 g/cm3 |
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Creetical pynt | 377 K, 6.28[1] MPa |
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Heat o fusion | 3.247 kJ/mol |
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Heat o vapourisation | 18.10 kJ/mol |
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Molar heat capacity | 5R/2 = 20.786 J/(mol·K) |
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Vapour pressur
P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
at T (K) |
110 |
121 |
134 |
152 |
176 |
211 |
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Atomic properties |
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Oxidation states | 0, +2, +6 |
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Electronegativity | Pauling scale: 2.2 |
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Covalent radius | 150 pm |
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Van der Waals radius | 220 pm |
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Spectral lines o radon |
Ither properties |
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Creestal structur | face-centred cubic (fcc) |
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Thermal conductivity | 3.61 m W/(m·K) |
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Magnetic orderin | non-magnetic |
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CAS Nummer | 10043-92-2 |
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History |
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Diskivery | Friedrich Ernst Dorn (1898) |
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First isolation | William Ramsay an Robert Whytlaw-Gray (1910) |
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Main isotopes o radon |
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Isotope |
Abundance |
Hauf-life (t1/2) |
Decay mode |
Product |
210Rn |
syn |
2.4 h |
α |
206Po |
211Rn |
syn |
14.6 h |
ε |
211At |
α |
207Po |
222Rn |
trace |
3.8235 d |
α |
218Po |
224Rn |
syn |
1.8 h |
β− |
224Fr |
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| references |