instance_of basic copper carbonate
ContextObjects in Spans , commonly abbreviated COinS , is a ___MASK41___ to embed bibliographic ___MASK74___ in the HTML code of web pages . This allows bibliographic software to publish machine - readable bibliographic items and client reference management software to retrieve bibliographic ___MASK74___ . The ___MASK74___ can also be sent to an OpenURL resolver . This allows , for instance , searching for a copy of a book in one ' s own local library . Basic copper carbonate normally refers to the compound ( Cu2 ( OH ) 2CO3 ) ( the mineral malachite ) . Sometimes the ___MASK14___ is used for Cu3 ( OH ) 2 ( CO3 ) 2 ( the related mineral azurite ) . Malachite and azurite can be found in the verdigris patina that is found on weathered brass , bronze , and copper . The composition of the patina can vary , in a maritime environment depending on the environment a basic chloride ___MASK4___ be present , in an urban environment basic sulfates ___MASK4___ be present . The compound Copper ( II ) carbonate CuCO3 is not known to occur naturally . There is a report from 1973 of the production of CuCO3 from CuO or Cu3 ( CO3 ) 2 ( OH ) 2 in the presence of carbon dioxide at 500 ° C and 20 kb ( 2 GPa ) pressure . What is often called copper ( II ) carbonate or cupric carbonate is actually basic copper carbonate . Carbon ( from " coal ") is a ___MASK92___ element with ___MASK39___ C and atomic number 6 . It is nonmetallic and tetravalent  making four electrons available to form covalent ___MASK92___ bonds . Three isotopes occur naturally , C and C being stable , while C is a radioactive isotope , decaying with a half - life of about 5 , 730 years . Carbon is one of the few elements known since antiquity . In chemistry , a carbonate is a ___MASK40___ of carbonic ___MASK26___ ( HCO ), characterized by the presence of the carbonate ion , . The name may also mean an ___MASK50___ of carbonic ___MASK26___ , an ___MASK13___ containing the carbonate group C (= O )( O ). Constantan , also known as Eureka , Advance and ___MASK88___ , is a copper  nickel alloy usually consisting of 55 % copper and 45 % nickel . Its main ___MASK19___ is its resistivity , which is constant over a wide range of temperatures . Other alloys with similarly low temperature coefficients are known , such as manganin ( CuMnNi ). Copper is a ___MASK92___ element with ___MASK39___ Cu ( from ) and atomic number 29 . It is a soft , malleable , and ductile metal with very high thermal and electrical conductivity . A freshly exposed ___MASK43___ of pure copper has a reddish - orange color . Copper is used as a conductor of heat and electricity , as a ___MASK60___ , and as a constituent of various metal alloys , such as sterling silver used in jewelry , cupronickel used to make marine hardware and coins , and constantan used in ___MASK20___ gauges and thermocouples for temperature measurement . Carbonic ___MASK26___ is a ___MASK57___ with the chemical formula HCO ( equivalently OC ( OH )). It is also a name sometimes given to solutions of carbon dioxide in water ( carbonated water ), because such solutions contain small amounts of HCO . In physiology , carbonic ___MASK26___ is described as " volatile ___MASK26___ " or " respiratory ___MASK26___ ", because it is the only ___MASK26___ excreted as a gas by the lungs . It plays an important role in the bicarbonate buffer system to maintain ___MASK26___  base homeostasis . In chemistry and ___MASK31___ , the atomic number of a chemical element ( also known as its proton number ) is the number of protons found in the nucleus of an atom of that element , and therefore identical to the charge number of the nucleus . It is conventionally represented by the symbol Z . The atomic number uniquely identifies a chemical element . In an uncharged atom , the atomic number is also equal to the number of electrons . A ___MASK92___ element or element is a ___MASK96___ of atoms having the same number of protons in their atomic nuclei ( i . e . the same atomic number , " Z "). There are 118 elements that have been identified , of which the first 94 occur naturally on Earth with the remaining 24 being synthetic elements . There are 80 elements that have at least one ___MASK3___ and 38 that have exclusively radioactive isotopes , which decay over ___MASK15___ into other elements . Iron is the most abundant element ( by mass ) making up Earth , while oxygen is the most common element in the Earth ' s crust . A ___MASK20___ gauge is a device used to measure ___MASK20___ on an object . Invented by Edward E . Simmons and Arthur C . Ruge in 1938 , the most common type of ___MASK20___ gauge consists of an insulating flexible backing which supports a metallic foil pattern . The gauge is attached to the object by a suitable adhesive , such as cyanoacrylate . As the object is deformed , the foil is deformed , causing its electrical resistance to change . This resistance change , usually measured using a Wheatstone ___MASK99___ , is related to the ___MASK20___ by the quantity known as the " gauge factor ". Sterling silver is an ___MASK30___ of silver containing 92 . 5 by weight of silver and 7 . 5 by weight of other metals , usually copper . The sterling silver standard has a minimum millesimal fineness of 925 . In chemistry , esters are ___MASK92___ compounds derived from an ___MASK26___ ( organic or inorganic ) in which at least one  OH ( hydroxyl ) group is replaced by an  O  alkyl ( alkoxy ) group . Usually , esters are derived from a ___MASK68___ and an alcohol . Glycerides , which are fatty ___MASK26___ esters of glycerol , are important esters in biology , being one of the main classes of lipids , and making up the bulk of animal fats and vegetable oils . Esters with low molecular weight are commonly used as fragrances and found in essential oils and pheromones . Phosphoesters form the backbone of DNA molecules . Nitrate esters , such as nitroglycerin , are known for their explosive properties , while polyesters are important plastics , with monomers linked by ___MASK50___ moieties . Cupronickel ( also known as copper - nickel ) is an ___MASK30___ of copper that contains nickel and strengthening elements , such as iron and manganese . Despite its high copper content , cupronickel is silver in colour . An ___MASK30___ is a ___MASK59___ of metals or a ___MASK59___ of a ___MASK94___ and another element . Alloys are defined by a metallic bonding character . An ___MASK30___ may be a solid solution of ___MASK94___ elements ( a ___MASK34___ phase ) or a ___MASK59___ of metallic phases ( two or more solutions ). Intermetallic compounds are alloys with a defined stoichiometry and crystal structure . Zintl phases are also sometimes considered alloys depending on bond types ( see also : Van Arkel - Ketelaar triangle for information on classifying bonding in binary compounds ). Nickel is a ___MASK92___ element with ___MASK39___ Ni and atomic number 28 . It is a silvery - white lustrous metal with a slight golden tinge . Nickel belongs to the transition metals and is hard and ductile . Pure nickel , powdered to maximize the reactive ___MASK43___ area , shows a significant ___MASK92___ activity , but larger pieces are slow to react with air under standard conditions because an oxide layer forms on the ___MASK43___ and prevents further corrosion ( passivation ). Even so , pure native nickel is found in Earth ' s crust only in tiny amounts , usually in ultramafic rocks , and in the interiors of larger nickel  iron meteorites that were not exposed to oxygen when outside Earth ' s atmosphere . Silver is the metallic element with the atomic ___MASK83___ 47 . Its ___MASK39___ is Ag , from the Latin "", derived from the Greek "  " ( literally " shiny " or " white "), and ultimately from a Proto - Indo - European language root reconstructed as *" her -", " grey " or " shining ". A soft , white , lustrous transition metal , it exhibits the highest electrical conductivity , thermal conductivity , and reflectivity of any metal . The metal is found in the Earth ' s crust in the pure , free elemental form (" native silver "), as an alloy with gold and other metals , and in minerals such as argentite and chlorargyrite . Most silver is produced as a byproduct of copper , gold , lead , and zinc refining . Silver is more abundant than gold , but it is much less abundant as a ___MASK63___ . Its purity is typically measured on a per mille basis ; a 94 %- pure alloy is described as " 0 . 940 ___MASK90___ ".