'cap': true googletag.cmd = googletag.cmd || []; Example 1. { bidder: 'appnexus', params: { placementId: '11654174' }}, dfpSlots['topslot_a'] = googletag.defineSlot('/2863368/topslot', [], 'ad_topslot_a').defineSizeMapping(mapping_topslot_a).setTargeting('sri', '0').setTargeting('vp', 'top').setTargeting('hp', 'center').addService(googletag.pubads()); },{ { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_HDX' }}, {code: 'ad_btmslot_a', pubstack: { adUnitName: 'cdo_btmslot', adUnitPath: '/2863368/btmslot' }, mediaTypes: { banner: { sizes: [[300, 250], [320, 50], [300, 50]] } }, const customGranularity = { Determining Coordination Number. partner: "uarus31" {code: 'ad_leftslot', pubstack: { adUnitName: 'cdo_leftslot', adUnitPath: '/2863368/leftslot' }, mediaTypes: { banner: { sizes: [[120, 600], [160, 600], [300, 600]] } }, { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_btmslot' }}, params: { { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_topslot' }}]}, { bidder: 'sovrn', params: { tagid: '346693' }}, { bidder: 'openx', params: { unit: '539971080', delDomain: 'idm-d.openx.net' }}, bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162050', zoneId: '776358', position: 'atf' }}, - 11913747 iasLog("exclusion label : mcp"); Answer: diamminesilver(I) dicyanoargentate(I). Click on the arrows to change the translation direction. { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_topslot' }}, Cooperative behavior of many animals can also be understood as an example of the prisoner's dilemma. For example, a compound with a coordination number of two will be linear, so these compounds are called collinear. { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_leftslot_160x600' }}, googletag.pubads().enableSingleRequest(); { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_topslot' }}]}, iasLog("criterion : cdo_pc = dictionary"); { bidder: 'sovrn', params: { tagid: '346698' }}, Coordination number is the term proposed by Werner to denote the total number of bonds from the ligands to the metal atom. var pbHdSlots = [ }, name: "_pubcid", { bidder: 'sovrn', params: { tagid: '446381' }}, name: "pubCommonId", 12 sentence examples: 1. }] { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_topslot' }}]}, { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_leftslot_160x600' }}, { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_btmslot' }}]}]; { bidder: 'openx', params: { unit: '539971066', delDomain: 'idm-d.openx.net' }}, [Co(NH 3) 6]Cl 3: hexaamminecobalt (III) chloride: 6 +3: 2. { bidder: 'ix', params: { siteId: '195466', size: [728, 90] }}, Coordination Number! The number of ligands bound to the transition metal ion is called the coordination number. Coordination Numbers and Geometry Lecture 2. Clear explanations of natural written and spoken English. { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_leftslot' }}]}, Introduction. Explain with two examples each of the following: coordination entity, ligand, coordination number, coordination polyhedron, homoleptic and heteroleptic. params: { • Some metals, such as chromium(III) and cobalt(III), consistently have the same coordination number (6 in the case of these two metals). { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_btmslot' }}]}]; { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_SR' }}, { bidder: 'appnexus', params: { placementId: '11654157' }}, iasLog("criterion : cdo_l = en"); { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_Billboard' }}, This chemistry video tutorial provides a basic introduction into naming coordination compounds. Solution (a) There are two Na + ions, so the coordination sphere has a negative two charge: [PtCl 6] 2−. The total number of points of attachment to the central element is termed the coordination number and this can vary from 2 to as many as 16, but is usually 6. { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_HDX' }}, { bidder: 'openx', params: { unit: '539971081', delDomain: 'idm-d.openx.net' }}, name: "identityLink", • Some metals, such as chromium(III) and cobalt(III), consistently have the same coordination number (6 in the case of these two metals). iasLog("criterion : sfr = cdo_dict_english"); Notice how the name of the metal differs even though they are the same metal ions. },{ { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_topslot' }}]}, Although coordination complexes are particularly important in the chemistry of the transition metals, some main group elements also form complexes. (a) Na 2 [PtCl 6] (b) K 3 [Fe(C 2 O 4) 3] (c) [Co(NH 3) 5 Cl]Cl 2. { Z.C. Coordination numbers are normally between two and nine. Werner referred to the central atom and the ligands surrounding it as the coordination sphere. For example, in the complex ions, [PtCl6] 2– and [Ni(NH3)4] 2+, the coordination number of Pt and Ni are 6 and 4 respectively. Most such complexes feature an additional water ligand, giving an overall, The electrostatic valency is a measure of the strength of bonds, being the valence charge divided by the, Different ligand structural arrangements result from the, There are other ways to obtain an estimate of the, However, in solution the shell is dynamic and so the, The concentration of the substituting nucleophile has no influence on this rate, and an intermediate of reduced, They came up with the methodology to pack asymmetric icosahedra into crystals using other polyhedra with larger, Other authors have relied on, for example, atomic conductance or bulk, Their solubility increases with temperature; adding more halides first decreases the solubility, but then increases due to complexation, with the maximum, Elements of the first row are limited to a maximum, For an atom at a surface of a crystal, the surface, X-ray diffraction on solutions yields a radial distribution function from which the, Chromium resides in a distorted octahedral position with a, In this structure both the metals and halides feature octahedral coordination geometry, in which each ion has a. pbjs.que = pbjs.que || []; Coordination Numbers and Oxidation States Determine the name of the following complexes and give the coordination number of the central metal atom. {code: 'ad_btmslot_a', pubstack: { adUnitName: 'cdo_btmslot', adUnitPath: '/2863368/btmslot' }, mediaTypes: { banner: { sizes: [[300, 250], [320, 50], [300, 50]] } }, The coordination number of a cation in a solid phase is an important parameter. 'min': 8.50, { bidder: 'ix', params: { siteId: '194852', size: [300, 250] }}, window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date; { bidder: 'sovrn', params: { tagid: '346688' }}, (d)Coordination number The coordination number (CN) of a metal ion in a complex can be defined as the number of ligand donor atoms to which the metal is directly bonded. 'max': 36, "sign-up": "https://dictionary.cambridge.org/auth/signup?rid=READER_ID", },{ • … { bidder: 'openx', params: { unit: '539971081', delDomain: 'idm-d.openx.net' }}, { bidder: 'appnexus', params: { placementId: '11654157' }}, 5.5 Coordination number of the lanthanide metal in the lanthanide higher oxides. Although coordination complexes are particularly important in the chemistry of the transition metals, some main group elements also form complexes. Examples of neutral carbonyl compounds are [Ni(CO) 4 ] (tetrahedral); [Fe(CO) 5 ] (trigonalbipyramidal); and [Mo(CO) 6 ] (octahedral). {code: 'ad_leftslot', pubstack: { adUnitName: 'cdo_leftslot', adUnitPath: '/2863368/leftslot' }, mediaTypes: { banner: { sizes: [[120, 600], [160, 600]] } }, syncDelay: 3000 { bidder: 'ix', params: { siteId: '195467', size: [300, 250] }}, { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }}, userSync: { Solution: The oxalate ion is a bidentate ligand. { bidder: 'appnexus', params: { placementId: '11654157' }}, }, },{ iasLog("criterion : cdo_ptl = entryex-mcp"); The nomenclature of the complexes is patterned after a system suggested by Alfred Werner, a Swiss chemist and Nobel laureate, whose outstanding work more than 100 years ago laid the foundation for a clearer understanding of these compounds. Browse our dictionary apps today and ensure you are never again lost for words. it can attach at more than one coordination site), the prefixes bis-, tris-, tetrakis-, and pentakis- are used instead.. (See examples 3 and {code: 'ad_btmslot_a', pubstack: { adUnitName: 'cdo_btmslot', adUnitPath: '/2863368/btmslot' }, mediaTypes: { banner: { sizes: [[300, 250]] } }, { bidder: 'ix', params: { siteId: '195451', size: [300, 250] }}, 'cap': true var mapping_btmslot_a = googletag.sizeMapping().addSize([746, 0], [[300, 250], 'fluid']).addSize([0, 0], [[300, 250], [320, 50], [300, 50], 'fluid']).build(); This video will help to find out coordination number and oxidation state of complexes. The coordination number of 6 results in an octahedral structure. Can you give the name of the following coordination compounds? = Ni = C = O; oxalate ion (ox) Oxalate ion is a bidentate ligand even though it contains four O atoms which have lone pairs of electrons. { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_topslot' }}, type: "html5", expires: 60 { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }}, In coordination chemistry, the coordination number is the number of ligands attached to the central ion (more specifically, the number of donor atoms). 'max': 8, Add the power of Cambridge Dictionary to your website using our free search box widgets. "authorizationTimeout": 10000 What is the coordination number for {eq}[Ag(NH_3)_2]NO_3 {/eq}? Coordination Numbers Examples: Example 1: Consider a methane molecule whose chemical formula is CH 4. googletag.enableServices(); Determining Coordination Number. Coordination number definition is - the number of attachments to the central atom in a coordination complex. Coordination numbers generally range between 2 and 12, with 4 (tetracoordinate) and 6 (hexacoordinate) being the most common. storage: { The word in the example sentence does not match the entry word. googletag.pubads().setCategoryExclusion('mcp').setCategoryExclusion('resp').setCategoryExclusion('wprod'); } { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_btmslot_300x250' }}, var googletag = googletag || {}; bidderSequence: "fixed" bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776140', position: 'atf' }}, iasLog("exclusion label : resp"); 'buckets': [{ Coordination Numbers and Geometry Lecture 2. The coordination number of first nearest neighbors in closed packed structures is 12. { bidder: 'ix', params: { siteId: '195467', size: [320, 50] }}, { bidder: 'ix', params: { siteId: '195467', size: [320, 100] }}, Coordination numbers can range from 2 up to 12, with 4 and 6 quite common for the upper transition metals. In coordination chemistry, the coordination number is the number of ligands attached to the central ion (more specifically, the number of donor atoms). addPrebidAdUnits(pbAdUnits); { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }}, { bidder: 'openx', params: { unit: '539971080', delDomain: 'idm-d.openx.net' }}, This is a coordination complex of 4 monodentate ammonia {eq}(NH_3) {/eq} ligands bound to a zinc +2 cation center. }); [Ni(ox) 2] 2-In this complex, two oxalate ions are bonded to the Ni atom. Please click here for a pdf version of this tutorial. iasLog("criterion : cdo_pt = ex"); 3. sodium monochloropentacyanoferrate(III). Coordination number: The total number of ligands bonded to the central metal atom is known as the coordination number. { bidder: 'ix', params: { siteId: '195451', size: [300, 50] }}, bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776130', position: 'btf' }}, Examples of coordination problems. Nevertheless, several metals crystallize in the body centered cubic structure (W type, Pearson symbol cI2, Figure 2.5).The coordination number is reduced to 8 but the difference of the distance between the first and the second nearest neighbors (white spheres) is small (15.5%). if(!isPlusPopupShown()) The number of ligands bound to the transition metal ion is called the coordination number. bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776140', position: 'atf' }}, Answer: ammonium diaquabis(oxalato)nickelate(II). ethylenediamine) or if it is a polydentate ligand (i.e. },{ name: "unifiedId", { bidder: 'sovrn', params: { tagid: '346688' }}, bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162050', zoneId: '776358', position: 'atf' }}, { bidder: 'appnexus', params: { placementId: '11654149' }}, The common name of this compound, iron carbonyl, is used more often. { bidder: 'appnexus', params: { placementId: '11654174' }}, Kang, in Handbook on the Physics and Chemistry of Rare Earths, 2008. The above examples are pentachlorocuprate(II) and pentacyanonickelate(II), respectively. bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776160', position: 'atf' }}, googletag.pubads().setTargeting("cdo_pc", "dictionary"); Coordination number is the term proposed by Werner to denote the total number of bonds from the ligands to the metal atom. } "noPingback": true, 'min': 31, { bidder: 'ix', params: { siteId: '195467', size: [300, 50] }}, }; { bidder: 'appnexus', params: { placementId: '11654149' }}, In neutral carbonyls, carbon monoxide molecules are bonded to the metal atom, which is often in oxidation state zero . // FIXME: (temporary) - send ad requests only if PlusPopup is not shown You can help! { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_topslot_728x90' }}, 'increment': 0.5, [Mn(OH 2) 5 SO 4] : coordination # = 6, and sulfate is inner sphere. { bidder: 'sovrn', params: { tagid: '346698' }}, Aluminum, tin, and lead, for example, form complexes such as the AlF 6 3-, SnCl 4 2-and PbI 4 2-ions. Typically the chemistry of complexes is dominated by interactions between s and p molecular orbitals of the ligan… 3. Coordination is developed in proportion to the number of repetitions of an engram practiced just below the maximal level of ability to perform." Coordination Number! priceGranularity: customGranularity, { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_btmslot_300x250' }}, dfpSlots['leftslot'] = googletag.defineSlot('/2863368/leftslot', [[120, 600], [160, 600]], 'ad_leftslot').defineSizeMapping(mapping_leftslot).setTargeting('sri', '0').setTargeting('vp', 'top').setTargeting('hp', 'left').addService(googletag.pubads()); Examples of high coordination number complexes are the ions formed by uranium and thorium with bidentate nitrate ion ligands, U(NO 3) 6 2− and Th(NO 3) 6 2−. 'pa pdd chac-sb tc-bd bw hbr-20 hbss lpt-25' : 'hdn'">. Coordination Number Examples . { bidder: 'ix', params: { siteId: '195451', size: [300, 250] }}, Examples of how to use “coordination number” in a sentence from the Cambridge Dictionary Labs Motor coordination to complete a task a collaboration of three skills: Fine Motor Skills Require coordinated … { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_SR' }}, In ethylene (H 2 C=CH 2), the coordination number of each carbon is 3, where each C is bonded to 2H + 1C for a total of 3 atoms. googletag.pubads().setTargeting("cdo_ei", "coordination-number"); Coordination numbers generally range between 2 and 12, with 4 (tetracoordinate) and 6 (hexacoordinate) being the most common. Types of Coordination. In coordination chemistry, the coordination number is the number of ligands attached to the central ion (more specifically, the number of donor atoms). name: "pbjs-unifiedid", Werner referred to… googletag.pubads().addEventListener('slotRenderEnded', function(event) { if (!event.isEmpty && event.slot.renderCallback) { event.slot.renderCallback(event); } }); Coordination Number Examples. googletag.pubads().disableInitialLoad(); dfpSlots['topslot_b'] = googletag.defineSlot('/2863368/topslot', [[728, 90]], 'ad_topslot_b').defineSizeMapping(mapping_topslot_b).setTargeting('sri', '0').setTargeting('vp', 'top').setTargeting('hp', 'center').addService(googletag.pubads()); { bidder: 'ix', params: { siteId: '194852', size: [300, 250] }}, The central carbon atom is bonded to four hydrogen atoms, so its coordination number is 4. { bidder: 'appnexus', params: { placementId: '11653860' }}, bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776160', position: 'atf' }}, initAdSlotRefresher(); { bidder: 'sovrn', params: { tagid: '346688' }}, googletag.pubads().setTargeting("cdo_tc", "resp"); These are rare, but are found when ligands are particularly large. dfpSlots['btmslot_a'] = googletag.defineSlot('/2863368/btmslot', [[300, 250], 'fluid'], 'ad_btmslot_a').defineSizeMapping(mapping_btmslot_a).setTargeting('sri', '0').setTargeting('vp', 'btm').setTargeting('hp', 'center').addService(googletag.pubads()); expires: 365 2. { bidder: 'ix', params: { siteId: '195464', size: [120, 600] }}, coordination number doesn't have a definition yet. var dfpSlots = {}; Coordination number Ionic Crystals Ions in an ionic crystal are held together by electrostatic forces. }; } 'cap': true googletag.cmd.push(function() { iasLog("criterion : cdo_tc = resp"); Factors Effecting Coordination Number. The coordination number of 4 results in a square planar structure. Coordination Number Examples. Werner referred to… { bidder: 'appnexus', params: { placementId: '11654208' }}, { bidder: 'openx', params: { unit: '539971080', delDomain: 'idm-d.openx.net' }}, Since it is a neutral complex, it is named in the same way as a complex cation. Carbon has a coordination number of 4 in a methane (CH 4) molecule since it has four hydrogen atoms bonded to it. In ethylene (H 2 C=CH 2), the coordination number of each carbon is 3, where each C is bonded to 2H + 1C for a total of 3 atoms. 'max': 3, pbjs.setConfig(pbjsCfg); "authorizationFallbackResponse": { The number of bonds depends on the size, charge, and electron configuration of the metal ion and the ligands. Carbonyl compounds and organometallic compounds are two groups of coordination compounds in which carbon atoms are bonded to the metal center. Again, these are rare. 'increment': 1, name: "idl_env", example: [Mn(OH 2) 6]SO 4: coordination #=6, and sulfate is outer sphere. Examples of how to use “coordination number” in a sentence from the Cambridge Dictionary Labs googletag.pubads().setTargeting("cdo_ptl", "entryex-mcp"); Coordination numbers are normally between two and nine. expires: 365 Aluminum, tin, and lead, for example, form complexes such as the AlF 6 3-, SnCl 4 2-and PbI 4 2-ions. {code: 'ad_topslot_b', pubstack: { adUnitName: 'cdo_topslot', adUnitPath: '/2863368/topslot' }, mediaTypes: { banner: { sizes: [[728, 90]] } }, 6. hexaammineiron(III) hexacyanochromate (III). The coordination number of a specified atom in a chemical species is the "number of other atoms directly linked to that specified atom. K[AuCl 4] Potassium tetrachloroaurate(III) 4 +3: 3. The ammonia ligands are uncharged, so the charge on the complex is also +2. { bidder: 'ix', params: { siteId: '195464', size: [300, 600] }}, { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_btmslot' }}]}]; { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_leftslot' }}, googletag.pubads().setTargeting("cdo_pt", "ex"); }); Coordination numbers of three are called trigonal planar. The total number of neighbouring atoms to a specific atom in a crystal depends on the location of the atom in the crystal. "loggedIn": false Coordination Complex: A single metal cation can form covalent bonds with multiple electron-rich molecules or ions, known as ligands. Often animals engage in long term partnerships, which can be more specifically modeled as iterated prisoner's dilemma. }], { bidder: 'sovrn', params: { tagid: '387233' }}, Coordination Compound Examples . ga('set', 'dimension2', "ex"); { bidder: 'ix', params: { siteId: '195464', size: [160, 600] }}, googletag.pubads().setTargeting("sfr", "cdo_dict_english"); Carbon has a coordination number of 4 in a methane (CH 4) molecule since it has four hydrogen atoms bonded to it. bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776160', position: 'atf' }}, Specific examples include hemoglobin, chlorophyll, dyes, pigments, vitamin B12, enzymes, catalysts, and Ru 3 (CO) 12. bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162050', zoneId: '776336', position: 'btf' }}, • The most commonly encountered numbers … { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_Billboard' }}, ga('send', 'pageview'); These examples are from corpora and from sources on the web. Only you will see it until the Cambridge Dictionary team approves it, then other users will be able to see it and vote on it. { bidder: 'sovrn', params: { tagid: '346693' }}, { bidder: 'onemobile', params: { dcn: '8a9690ab01717182962182bb50ce0007', pos: 'cdo_btmslot_mobile_flex' }}, The number of bonds depends on the size, charge, and electron configuration of the metal ion and the ligands. bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162050', zoneId: '776336', position: 'btf' }}, {code: 'ad_btmslot_a', pubstack: { adUnitName: 'cdo_btmslot', adUnitPath: '/2863368/btmslot' }, mediaTypes: { banner: { sizes: [[300, 250]] } }, 'min': 3.05, var mapping_leftslot = googletag.sizeMapping().addSize([1063, 0], [[120, 600], [160, 600], [300, 600]]).addSize([963, 0], [[120, 600], [160, 600]]).addSize([0, 0], []).build(); { bidder: 'openx', params: { unit: '539971063', delDomain: 'idm-d.openx.net' }}, Probably the most famous of the organometallic compounds is the exceedingly stable orange ferrocene… { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_topslot_728x90' }}, { bidder: 'onemobile', params: { dcn: '8a9690ab01717182962182bb50ce0007', pos: 'cdo_btmslot_mobile_flex' }}, { bidder: 'onemobile', params: { dcn: '8a9690ab01717182962182bb50ce0007', pos: 'cdo_topslot_mobile_flex' }}, { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_btmslot' }}]}]; var pbMobileLrSlots = [ { bidder: 'appnexus', params: { placementId: '11653860' }}, Cu 2 [Fe(CN) 6] copper(II) hexacyanoferrate(II) 6 +2: 4. iasLog("criterion : cdo_ei = coordination-number"); Coordination numbers are normally between two and nine. { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_topslot' }}, The following five rules are used for naming complexes: When the complex is either a cation or a neutral molecule, the name of the central metal atom is spelled exactly like the name of the element and is followed by a Roman numeral in parentheses to indicate its … { bidder: 'ix', params: { siteId: '195466', size: [728, 90] }}, Coordination Number. Structural properties , such as packin {code: 'ad_topslot_a', pubstack: { adUnitName: 'cdo_topslot', adUnitPath: '/2863368/topslot' }, mediaTypes: { banner: { sizes: [[300, 250]] } }, { bidder: 'appnexus', params: { placementId: '11654208' }}, The Greek prefixes di-, tri-, tetra-, etc. { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_btmslot' }}]}]; Coordination Number. { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_btmslot_300x250' }}, "sign-out": "https://dictionary.cambridge.org/auth/signout?rid=READER_ID"

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