Chalcogen

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Group	16
Period
2	8 O
3	16 S
4	34 Se
5	52 Te
6	84 Po
7	116 Uuh

The chalcogens (with the "ch" pronounced like a k) are the name for the periodic table group 16 (old-style: VIB or VIA) in the periodic table. It is sometimes known as the oxygen family. It consists of the elements oxygen (O), sulfur (S), selenium (Se), tellurium (Te), the radioactive polonium (Po), and the synthetic ununhexium (Uuh). The compounds of the heavier chalcogens (particularly the sulfides, selenides, and tellurides) are collectively known as chalcogenides. Unless grouped with a heavier chalcogen, oxides are not considered chalcogenides.

The name is generally considered to mean "ore former" from the Greek chalcos "ore" and -gen "formation". [2]

Oxygen and sulfur are nonmetals, and polonium, selenium and tellurium are metalloid semiconductors (i.e., their electrical properties are between those of a metal and an insulator). Nevertheless, tellurium, as well as selenium, is often referred to as a metal when in elemental form.

Chalcogens are quite common as minerals. For example, pyrite (FeS₂) is an iron ore and AuTe₂ gave its name to the gold rush town of Telluride, Colorado in the United States.

The formal oxidation number of the chalcogen is generally -2 in a chalcogenide but other values, such as -1 in pyrite, can be attained.

The highest formal oxidation number +6 is found in sulfates, selenates and tellurates, such as in sodium selenate (Na₂SeO₄). Modern chemical understanding based on quantum theory somewhat outdates the use of formal oxidation numbers in favour of a many-electron wavefunction approach allowing detailed computer simulation, though the concept, while flawed, is still useful in thought experiments.

Explanation of above periodic table slice:

Nonmetals	Metalloids	Poor metals	Atomic numbers in red are gases	Atomic numbers in black are solids	Solid borders indicate primordial elements (older than the Earth)	Dashed borders indicate radioactive natural elements	Dotted borders indicate radioactive synthetic elements

v • d • e Periodic tables
Layouts	Standard · Vertical · Full names · Names and atomic masses · Text for last · Huge table · Metals and nonmetals · Blocks · Valences · Inline f-block · 218 elements · Electron configurations · Atomic masses · Electronegativities · Alternatives
Lists of elements	Name · Atomic symbol · Atomic number · Boiling point · Melting point · Density · Atomic mass
Groups	1 ·  2 ·  3 ·  4 ·  5 ·  6 ·  7 ·  8 ·  9 ·  10 ·  11 ·  12 ·  13 ·  14 ·  15 ·  16 ·  17 ·  18
Periods:	1 ·  2 ·  3 ·  4 ·  5 ·  6 ·  7 ·  8
Series	Alkalis ·  Alkaline earths ·  Lanthanides ·  Actinides ·  Transition metals · Poor metals ·  Metalloids ·  Nonmetals ·  Halogens ·  Noble gases
Blocks	s-block ·  p-block ·  d-block ·  f-block ·  g-block

See also

• Gold chalcogenides
• Periodic table

External links

• A Second Note on the Term "Chalcogen"ar:مجموعة كالكوجين

ast:Elementos del grupu 16 bg:Кислородна група ca:Calcogen cs:Chalkogen de:Chalkogeneeo:Elemento de grupo 16 fr:Chalcogène ko:16족 원소 it:Elementi del gruppo 16 sw:Kundi la Halkojeni la:Chalcogenica lmo:Calcògen nl:Zuurstofgroep ja:第16族元素 nn:Chalkogen nds:Chalkogenqu:Ch'uqichaq sk:Chalkogény sl:Halkogen sr:16. група хемијских елемената sh:16. grupa hemijskih elemenata fi:Happiryhmä sv:Syregruppen th:แชลโคเจน vi:Nhóm nguyên tố 16

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Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .