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element, atomic number 86, is the last six or elements or groups of O in the periodic table is a noble gas or inert gas.
atomic weight 222.02 amu
Melting point -71 ° c
boiling point -61.8 ° c
density 9.72 g / l at 0 ° c.
The oxidation number of 0 or (+2, +4 and +6).
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