Chalcogen
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Difference (from prior minor revision)
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Changed: 2c2
oxygen
,
sulfur
,
selenium
, telurium
?
and
polonium
oxygen
,
sulfur
,
selenium
,
tellurium
and
polonium
In
chemistry
, an elemental group consiting of
oxygen
,
sulfur
,
selenium
,
tellurium
and
polonium