The chalcogens (with the "ch" pronounced with a hard "c" as in "chemistry") 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. A periodic table group is a vertical column in the periodic table of the chemical elements. ... In the periodic table of the elements, a period is a row of the table. ... A period 2 element is one of the chemical elements in the second row (or period) of the periodic table of the elements. ... This article is about the chemical element oxygen. ... A period 3 element is one of the chemical elements in the third row (or period) of the periodic table of the elements. ... General Name, Symbol, Number sulfur, S, 16 Chemical series nonmetals Group, Period, Block 16, 3, p Appearance lemon yellow Atomic mass 32. ... A period 4 element is one of the chemical elements in the fourth row (or period) of the periodic table of the elements. ... General Name, Symbol, Number selenium, Se, 34 Chemical series nonmetals Group, Period, Block 16, 4, p Appearance gray, metallic luster Atomic mass 78. ... A period 5 element is one of the chemical elements in the fifth row (or period) of the periodic table of the elements. ... General Name, Symbol, Number tellurium, Te, 52 Chemical series metalloids Group, Period, Block 16, 5, p Appearance silvery lustrous gray Atomic mass 127. ... A period 6 element is one of the chemical elements in the sixth row (or period) of the periodic table of the elements, including the Lanthanides. ... General Name, Symbol, Number polonium, Po, 84 Chemical series metalloids Group, Period, Block 16, 6, p Appearance silvery Atomic mass (209) g/mol Electron configuration [Xe] 4f14 5d10 6s2 6p4 Electrons per shell 2, 8, 18, 32, 18, 6 Physical properties Phase solid Density (near r. ... A period 7 element is one of the chemical elements in the seventh row (or period) of the periodic table of the elements. ... Predicted properties Name, Symbol, Number Ununhexium, Uuh, 116 Chemical series Presumably poor metals Group, Period, Block 16, 7 , p Appearance Unknown, probably a metallic and silvery white or grey color Atomic weight [292] amu Electron configuration [Rn] 5f14 6d10 7s27p4 (a guess based upon polonium) e-s per energy level... Chemistry (in Greek: χημεία) is the science of matter and its interactions with energy and itself (see physics, biology). ... A periodic table group is a vertical column in the periodic table of the chemical elements. ... The periodic table of the chemical elements, also called the Mendeleev periodic table, is a tabular display of the known chemical elements. ... A chemical element, often called simply element, is the class of atoms which contain the same number of protons. ... This article is about the chemical element oxygen. ... General Name, Symbol, Number sulfur, S, 16 Chemical series nonmetals Group, Period, Block 16, 3, p Appearance lemon yellow Atomic mass 32. ... General Name, Symbol, Number selenium, Se, 34 Chemical series nonmetals Group, Period, Block 16, 4, p Appearance gray, metallic luster Atomic mass 78. ... General Name, Symbol, Number tellurium, Te, 52 Chemical series metalloids Group, Period, Block 16, 5, p Appearance silvery lustrous gray Atomic mass 127. ... General Name, Symbol, Number polonium, Po, 84 Chemical series metalloids Group, Period, Block 16, 6, p Appearance silvery Atomic mass (209) g/mol Electron configuration [Xe] 4f14 5d10 6s2 6p4 Electrons per shell 2, 8, 18, 32, 18, 6 Physical properties Phase solid Density (near r. ... Predicted properties Name, Symbol, Number Ununhexium, Uuh, 116 Chemical series Presumably poor metals Group, Period, Block 16, 7 , p Appearance Unknown, probably a metallic and silvery white or grey color Atomic weight [292] amu Electron configuration [Rn] 5f14 6d10 7s27p4 (a guess based upon polonium) e-s per energy level... In chemistry, a sulfide (sulphide in British and Canadian English) is a chemical compound or combination of sulfur with an oxidation number of -2, with another chemical element or a radical thereof. ... The selenide ion is Se2-. A selenide is a chemical compound in which selenium serves as a anion with oxidation number of -2, much as sulfur does in a sulfide. ... Telluride is either: A compound of a metal with the element Tellurium. ... An oxide is a chemical compound of oxygen with other chemical elements. ...

The name is generally considered to mean "ore former" from the Greek chalcos "ore" and -gen "formation". [1]

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. Together with the metals and metalloids, a nonmetal is one of three categories of chemical elements as distinguished by ionization and bonding properties. ... Together with the metals and nonmetals, the metalloids (in Greek metallon = metal and eidos = sort - also called semimetals) form one of the three categories of chemical elements as classified by ionization and bonding properties. ... A semiconductor is a material with an electrical conductance that is intermediate to those of an insulator and a conductor. ... Insulators are materials which prevent the flow of heat (thermal insulators) or electric charge (electrical insulators). ...

Chalcogenides are quite common as minerals. For example, FeS₂ (pyrite) is an iron ore and AuTe₂ gave its name to the gold rush town of Telluride, Colorado in the United States. The mineral pyrite, or iron pyrite, is iron disulfide, FeS2. ... Old Town Telluride Telluride is a town located in San Miguel County in southwestern Colorado on the San Miguel River on the west side of the San Juan Mountains. ...

The formal oxidation number of the chalcogen is generally -2 in a chalcogenide but other values (e.g. -1 in pyrite) can be attained. The oxidation state or oxidation number is defined as the sum of negative and positive charges in an atom, which indirectly indicates the number of electrons it has accepted or donated. ...

The highest formal oxidation number +6 is found in sulfates, selenates and tellurates, e.g. in Na₂SeO₄ (sodium selenate). 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. Quantum chemistry is a branch of theoretical chemistry, which applies quantum mechanics to problems in chemistry. ... In computational physics and computational chemistry, the Hartree-Fock (HF) or self-consistent field (SCF) calculation scheme is a self-consistent iterative variational procedure to calculate the Slater determinant (or the molecular orbitals which it is made of) for which the expectation value of the electronic molecular Hamiltonian is minimum. ...

State at standard temperature and pressure those numbered in red are gases those numbered in green are liquids those numbered in black are solid Natural occurrence those without borders have not been discovered/synthesized yet those with dotted borders do not occur naturally (Synthetic elements) those with dashed borders naturally... The Alternate Table is a periodic table perpendicularly rotated counterclockwise, hence like in many writing systems, the lower groups are to the left and the number increases to the right. ... ... The large version of the periodic table set out below does not fit into some computer screens; however, with a small font size and/or in landscape mode, it may be possible to print this periodic table on one or two normal-size sheets of paper. ... The Detailed Table is a smaller version of the Huge Table. ... The text-only table is a version of the Huge Table designed for printing atomic mass data. ... Color coding for atomic numbers: Elements numbered in blue are liquids at Standard Temperature and Pressure (STP); those numbered in green are gases at STP; those numbered in black are solid at STP; those numbered in red are synthetic (all are solid at STP). ... This extended periodic table was suggested by Glenn T. Seaborg in 1969. ... ... Color coding for atomic numbers: Elements numbered in blue are liquids at Standard Temperature and Pressure (STP); those in green are gases at STP; those in black are solid at STP; those in red are synthetic (all are solid at STP). ... Color coding for atomic numbers: Elements numbered in blue are liquids at Standard Temperature and Pressure (STP); those in green are gases at STP; those in black are solid at STP; those in red are synthetic (all are solid at STP). ... This is a list of the chemical elements, sorted by name. ... This is a list of chemical elements by symbol, including the current symbols used to identify the chemical elements as recognized by the International Union of Pure and Applied Chemistry, as well as proposed and historical symbols. ... Categories: Chemical elements ... This is a list of the chemical elements, sorted by boiling point measured at normal pressure. ... This is a list of the chemical elements, sorted by melting point measured at normal pressure. ... This is a list of the chemical elements, sorted by density measured at standard temperature and pressure. ... Hydrogen = 1 List of Elements in Atomic Number Order. ... A periodic table group is a vertical column in the periodic table of the chemical elements. ... The alkali metals are the series of elements in Group 1 (IUPAC style) of the periodic table, excluding hydrogen: that is, lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr). ... The alkaline earth metals are the series of elements in Group 2 of the periodic table: beryllium, magnesium, calcium, strontium, barium and radium (not always considered due to its very short half-life and its radioactive characteristics). ... A Group 3 element is an element in periodic table group 3 (IUPAC style) in the periodic table, which consists of: scandium (21) yttrium (39) lanthanum (57) - lutetium (71) actinium (89) - lawrencium (103) All of these elements are classed in Group 3 because their outer shell holds three electrons. ... A Group 4 element is an element in periodic table group 4 (IUPAC style) in the periodic table, which consists of: titanium (22) zirconium (40) hafnium (72) rutherfordium (104) All of these elements are classed in Group 4 because their valence shell holds four electrons. ... A Group 5 element is an element in periodic table group 5 (IUPAC style) in the periodic table, which consists of: vanadium (23) niobium (41) tantalum (73) dubnium (105) All of these elements are classed in Group 5 because their valence shell holds four electrons. ... The group 6 in the periodic table consists of the elements chromium (24) molybdenum (42) tungsten (74) seaborgium (106) Group 6 is the new IUPAC name for this group, the old style name was group VIA in the old European system or group VIB in the old US system. ... A Group 7 element is an element in periodic table group 7 (IUPAC style) in the periodic table, which consists of: manganese (25) technetium (43) rhenium (75) bohrium (107) All of these elements are classed in Group 7 because their valence shell holds four electrons. ... A Group 8 element is an element in periodic table group 8 (IUPAC style) in the periodic table, which consists of: Iron (26) Ruthenium (44) Osmium (76) Hassium (108) All of these elements are classed in Group 8 because their valence shell holds four electrons. ... The Group 9 elements are: Cobalt (27) Rhodium (45) Iridium (77) Meitnerium (109) Color coding for these atomic numbers: At room temperature, all are solid; red indicates item is synthetic and does not occur naturally. ... The Group 10 elements are: Nickel (28) Palladium (46) Platinum (78) Darmstadtium (110) Color coding for these atomic numbers: At room temperature, all are solid; red indicates item is synthetic and does not occur naturally. ... The Group 11 Elements (IB) of the periodic table consist of the traditional coinage metals of copper, silver, and gold. ... The Group 12 elements are: Zinc (30) Cadmium (48) Mercury (80) Ununbium (112) Color coding for these atomic numbers: At room temperature, all are solid but mercury is liquid; red indicates item is synthetic and does not occur naturally. ... The Boron group is periodic table group 13 (IUPAC style) in the periodic table. ... The carbon group is group 14 (IUPAC style) in the periodic table. ... The Nitrogen group is also known as IUPAC Group 15 (formerly Group V) of the periodic table. ... For the halogen light bulb, click here. ... The noble gases are the chemical elements in group 18 (old-style Group 0) of the periodic table. ... In the periodic table of the elements, a period is a row of the table. ... A period 1 element is one of the chemical elements in the first row (or period) of the periodic table of the elements. ... A period 2 element is one of the chemical elements in the second row (or period) of the periodic table of the elements. ... A period 3 element is one of the chemical elements in the third row (or period) of the periodic table of the elements. ... A period 4 element is one of the chemical elements in the fourth row (or period) of the periodic table of the elements. ... A period 5 element is one of the chemical elements in the fifth row (or period) of the periodic table of the elements. ... A period 6 element is one of the chemical elements in the sixth row (or period) of the periodic table of the elements, including the Lanthanides. ... A period 7 element is one of the chemical elements in the seventh row (or period) of the periodic table of the elements. ... A period 8 element is one of the chemical elements in the eighth row (or period) of the periodic table of the elements. ... A period 9 element is one of the chemical elements in the ninth row (or period) of the periodic table of the elements. ... A chemical series is a group of chemical elements whose physical and chemical characteristics vary progressively from one end of the series to another. ... The alkali metals are the series of elements in Group 1 (IUPAC style) of the periodic table, excluding hydrogen: that is, lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr). ... The alkaline earth metals are the series of elements in Group 2 of the periodic table: beryllium, magnesium, calcium, strontium, barium and radium (not always considered due to its very short half-life and its radioactive characteristics). ... The lanthanide series comprises the 14 rare earth elements from cerium to lutetium on the periodic table, with atomic numbers 58 through 71. ... The actinide series encompasses the 14 chemical elements that lie between thorium and lawrencium on the periodic table with atomic numbers 90 - 103 inclusive. ... In chemistry, the term transition metal (sometimes also called a transition element) has two possible meanings: It commonly refers to any element in the d-block of the periodic table, including zinc and scandium. ... The poor metals or post-transition metals are the metallic elements of the p-block, occurring between the metalloids and the transition metals, shown belown in red. ... Together with the metals and nonmetals, the metalloids (in Greek metallon = metal and eidos = sort - also called semimetals) form one of the three categories of chemical elements as classified by ionization and bonding properties. ... Together with the metals and metalloids, a nonmetal is one of three categories of chemical elements as distinguished by ionization and bonding properties. ... For the halogen light bulb, click here. ... The noble gases are the chemical elements in group 18 (old-style Group 0) of the periodic table. ... A block of the periodic table of elements is a set of adjacent groups. ... The s-block of the periodic table of elements consists of the first two groups: the alkali metals and alkaline earth metals, plus hydrogen. ... The p-block of the periodic table of elements consists of the last six groups. ... D Block is a rap group based in Yonkers, New York. ... The f-block of the periodic table of elements consists of those elements for which, in the atomic ground state, the highest-energy electrons occupy f-orbitals. ... The g-block of the periodic table of elements consists of those elements for which, in the atomic ground state, the highest-energy electrons occupy g-orbitals. ...

See also

• gold chalcogenides
• periodic table

Gold chalcogenides are gold compounds with anions from periodic table group 16, known as the chalcogens. ... The periodic table of the chemical elements, also called the Mendeleev periodic table, is a tabular display of the known chemical elements. ...

External links

• A Second Note on the Term "Chalcogen"