Mendeleev's Periodic Table > Rn - Radon

Rn - Radon

At ordinary temperatures radon is a colourless gas. When cooled below the freezing point, radon exhibits a brilliant phosphorescence which becomes yellow as the temperature is lowered and orange-red at the temperature of liquid air. The main hazard is from inhalation of the element and its decay products which are collected on dust in the air. Recently, radon buildup in homes from the surrounding soil and rocks has become a safety issue and some areas around the world test homes for radon gas. It is the heaviest known gas. Radon is present in some spring waters.

Atomic number - 86 Density g/L 9 .91
Atomic weight u 222 Melting point K 202
Bonding radius A - Boiling point K 211
Atomic radius A 1 .34 Heat of vaporization kJ/mol 16 .4
Ionization Potential V 10 .748 Heat of fusion kJ/mol 2 .89
Electronegativity - - Specific heat J/gK 0 .09
The oxide is unknown. Crystal are face centered cubic.
Electron config. : [Xe] 4f14 5d10 6s2 6p6

Isotopes of Rn (Radon) :

MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 198
64 msec
a/EC,7.345
Po-194/At-198
197.99877 		199
0.62 sec
a/EC,7.140
Po-195/At-199
198.99830 		200
1.06 sec
a/EC,7.043
Po-196/At-200
199.99567 		201
7.0 sec
a/EC,6.860
Po-197/At-201
200.99553
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 202
9.85 sec
a/EC,4.450
Po-198/At-202
201.99322 		203
45 sec
a/EC,6.630
Po-199/At-203
202.99334 		204
1.24 min
a/EC,6.546
Po-200/At-204
203.99136 		205
2.8 min
a/EC,5.240
Po-201/At-205
204.99166
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 206
5.67 min
a/EC,6.384
Po-202/At-206
205.99015 		207
9.25 min
a/EC,4.610
Po-203/At-207
206.99072 		208
24.35 min
a/EC,6.260
Po-204/At-208
207.98963 		209
28.5 min
a/EC,3.930
Po-205/At-209
208.99038
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 210
2.4 hr
a/EC,6.159
Po-206/At-210
209.98968 		211
14.6 hr
a/EC,2.892
Po-207/At-211
210.99058 		212
23.9 min
a,6.385 MeV
Po-208
211.99068 		213
25.0 msec
a,8.243 MeV
Po-209
212.99386
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 214
0.27 usec
a,9.208 MeV
Po-210
213.99534 		214a
6.5 nsec
a,10.833 MeV
Po-210
213.99709 		215
2.30 usec
a,8.839 MeV
Po-211
214.99872 		216
45 usec
a,8.200 MeV
Po-212
216.00025
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 217
0.54 msec
a,7.889 MeV
Po-213
217.00391 		218
35 msec
a,7.263 MeV
Po-214
218.00558 		219
3.96 sec
a,6.946 MeV
Po-215
219.00947 		220
55.6 sec
a,6.405 MeV
Po-216
220.01138
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 221
25 min
a/B-,1.220
Po-217/Fr-221
221.01555 		222
3.8235 da
a,5.590 MeV
Po-218
222.01757 		223
23.2 min
B-,5.590 MeV
Fr-223
223.02166 		224
107 min
B-,5.590 MeV
Fr-224
224.02404
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 225
4.5 min
B-,5.590 MeV
Fr-225
225.02848 		226
7.4 min
B-,1.400 MeV
Fr-226
226.03091 		227
22.5 sec
B-,1.400 MeV
Fr-227
227.03559 		228
65 sec
B-,1.400 MeV
Fr-228
228.0