Rn Radon Index (original) (raw)

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Radon (Rn) Element Properties

Atomic Mass 222
Atomic Number 86
Name Origins Named after the element radium.
Year Discovered 1900
Discovery Credits Discovered by F. E. Dorn at Halle, Germany.
Remarks Colorless, odorless gas produced by radioactive decay of radium. Little studied because of hazardous radiation which destroys any compounds that are formed. Chemically should be like xenon. Radon is present in uranium and thorium minerals as a radioactive gas which can enter the atmosphere.
References Emsley, J., 1991; THE ELEMENTS : Sec. Ed., Clarendon Press, Oxford, 251 p.
See Also WebElements,ChemiCool

Naturally Occurring Isotopes

Symbol Isotope Mass Isotope Nuclide Number Isotope Number Natural Abundance Half-life Half-life Units Decay Mode Decay Mode MeV Decay Mode %
Rn 219.009479 219 86 0.0001% 3.96 Seconds alpha 6.946 100.0%
Rn 220.011368 220 86 0.1000% 55.6 Seconds alpha 6.404 100.0%
Rn 222.01757 222 86 99.9000% 3.83 Days alpha 5.59 100.0%

There are no Minerals containing Rn (Radon) in the chemical formulae

Group 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Period
1 1 H 2 He
2 3 Li 4 Be 5 B 6 C 7 N 8 O 9 F 10 Ne
3 11 Na 12 Mg 13 Al 14 Si 15 P 16 S 17 Cl 18 Ar
4 19 K 20 Ca 21 Sc 22 Ti 23 V 24 Cr 25 Mn 26 Fe 27 Co 28 Ni 29 Cu 30 Zn 31 Ga 32 Ge 33 As 34 Se 35 Br 36 Kr
5 37 Rb 38 Sr 39 Y 40 Zr 41 Nb 42 Mo 43 Tc 44 Ru 45 Rh 46 Pd 47 Ag 48 Cd 49 In 50 Sn 51 Sb 52 Te 53 I 54 Xe
6 55 Cs 56 Ba * 71 Lu 72 Hf 73 Ta 74 W 75 Re 76 Os 77 Ir 78 Pt 79 Au 80 Hg 81 Tl 82 Pb 83 Bi 84 Po 85 At 86 Rn
7 87 Fr 88 Ra ** 103 Lr 104 Rf 105 Db 106 Sg 107 Bh 108 Hs 109 Mt 110 Ds
-
*Lanthanides * 57 La 58 Ce 59 Pr 60 Nd 61 Pm 62 Sm 63 Eu 64 Gd 65 Tb 66 Dy 67 Ho 68 Er 69 Tm 70 Yb
**Actinides ** 89 Ac 90 Th 91 Pa 92 U 93 Np 94 Pu 95 Am 96 Cm 97 Bk 98 Cf 99 Es 100 Fm 101 Md 102 No