[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-1-en-105":3,"doc-seo-562209-105":53,"doc-detail-562209-en":126},{"code":4,"msg":5,"data":6},0,"success",[7,14,19,24,29,34,39,44,49],{"id":8,"doc_module":9,"doc_module_name":10,"category_name":11,"show_sort_weight":12,"slug":13},11,1,"Template","Presentations",90,"presentations",{"id":15,"doc_module":9,"doc_module_name":10,"category_name":16,"show_sort_weight":17,"slug":18},12,"Resumes",80,"resumes",{"id":20,"doc_module":9,"doc_module_name":10,"category_name":21,"show_sort_weight":22,"slug":23},14,"Invoices",70,"invoices",{"id":25,"doc_module":9,"doc_module_name":10,"category_name":26,"show_sort_weight":27,"slug":28},15,"Posters",60,"posters",{"id":30,"doc_module":9,"doc_module_name":10,"category_name":31,"show_sort_weight":32,"slug":33},16,"Social Media",50,"social-media",{"id":35,"doc_module":9,"doc_module_name":10,"category_name":36,"show_sort_weight":37,"slug":38},17,"Forms",40,"forms",{"id":40,"doc_module":9,"doc_module_name":10,"category_name":41,"show_sort_weight":42,"slug":43},18,"Letters",30,"letters",{"id":45,"doc_module":9,"doc_module_name":10,"category_name":46,"show_sort_weight":47,"slug":48},21,"Paper Templates",5,"papers-templates",{"id":50,"doc_module":9,"doc_module_name":10,"category_name":51,"show_sort_weight":4,"slug":52},158,"General","general-158",{"code":4,"msg":54,"data":55},"ok",{"site_id":56,"language":57,"slug":58,"title":59,"keywords":60,"description":61,"schema_data":62,"social_meta":119,"head_meta":121,"extra_data":123,"updated_unix":125},105,"en","shapes-of-molecules-vsepr-model-introduction-objectives-getting-started","SHAPES OF MOLECULES - VSEPR MODEL - Introduction - Objectives - Getting Started","","Molecules’ shapes are explained through the valence-shell electron-pair repulsion (VSEPR) model, which predicts geometry by minimizing repulsion between electron density regions around a central atom. The module links VSEPR assumptions to experimental crystal structure data using the Cambridge Structural Database via the interactive WebCSD teaching database. Learners are guided to inspect, rotate, zoom, and measure geometrical parameters, compare predicted and observed structures for HgCl2, HgCl3-, and HgCl42-, and determine the controlling factor for molecular geometry.",{"@graph":63,"@context":118},[64,80,101],{"@type":65,"itemListElement":66},"BreadcrumbList",[67,71,74,77],{"item":68,"name":69,"@type":70,"position":9},"https://docshare.wps.com","Home","ListItem",{"item":72,"name":10,"@type":70,"position":73},"https://docshare.wps.com/template/",2,{"item":75,"name":11,"@type":70,"position":76},"https://docshare.wps.com/template/presentations/",3,{"item":78,"name":59,"@type":70,"position":79},"https://docshare.wps.com/template/shapes-of-molecules-vsepr-model-introduction-objectives-getting-started/562209/",4,{"url":78,"name":59,"@type":81,"image":82,"author":87,"headline":59,"publisher":90,"fileFormat":93,"inLanguage":57,"description":61,"dateModified":94,"datePublished":95,"encodingFormat":93,"isAccessibleForFree":96,"interactionStatistic":97},"DigitalDocument",{"url":83,"@type":84,"width":85,"height":86},"https://docshare.wps.com/thumbnails/shapes-of-molecules-vsepr-model-introduction-objectives-getting-started/562209.png","ImageObject",442,249,{"name":88,"@type":89},"MrHarris58","Person",{"url":68,"name":91,"@type":92},"DocShare","Organization","application/pdf","2026-10-15","2026-10-12",true,{"@type":98,"interactionType":99,"userInteractionCount":9},"InteractionCounter",{"@type":100},"ViewAction",{"@type":102,"mainEntity":103},"FAQPage",[104,110,114],{"name":105,"@type":106,"acceptedAnswer":107},"What does the VSEPR model use to predict molecular shape?","Question",{"text":108,"@type":109},"It assumes that bonding pairs, lone pairs, and multiple bonds occupy positions as far apart as possible to minimize electron-electron repulsion, producing a minimum-energy arrangement.","Answer",{"name":111,"@type":106,"acceptedAnswer":112},"Which WebCSD teaching database resources are used in this module?",{"text":113,"@type":109},"Learners use the interactive WebCSD teaching database demo to browse entries in the teaching subset and view crystal structure geometries using reference codes (refcodes).",{"name":115,"@type":106,"acceptedAnswer":116},"How do the predicted shapes for HgCl2, HgCl3-, and HgCl42- differ?",{"text":117,"@type":109},"HgCl2 is predicted to be linear with a Cl-Hg-Cl angle of 180°, HgCl3- is trigonal planar with angles near 120°, and HgCl42- is tetrahedral with bond angles approaching 109.5°; students then measure angles to compare with experimental geometries.","https://schema.org",{"og:url":78,"og:type":120,"og:title":59,"og:site_name":91,"og:description":61},"article",{"robots":122,"canonical":78},"index,follow",{"doc_id":124,"site_id":56},562209,1792102856,{"code":4,"msg":5,"data":127},{"doc_id":124,"user_id":128,"nickname":88,"user_avatar":129,"doc_module":9,"category_id":8,"category_name":11,"doc_title":59,"doc_description":61,"doc_content":130,"file_id":131,"file_url":132,"file_type":133,"file_size":134,"view_count":9,"is_deleted":4,"is_public":9,"is_downloadable":9,"audit_status":9,"page_count":135,"language":136,"language_code":57,"site_id":56,"html_lang":57,"table_of_contents":137,"faqs":138,"seo_title":139,"seo_description":61,"update_tm":140,"read_time":79},687212988360,"https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c","1 SHAPES OF MOLECULES: VSEPR MODEL  \n1.1 INTRODUCTION  \n• The shapes of molecules tend to be controlled by the number of electrons in the valence shell of the central atom. The valence-shell electron-pair repulsion (VSEPR) model provides a simple method for predicting the shapes of such species.  \n• The Cambridge Structural Database contains a wealth of diverse molecular geometries, and provides the ability to visualise and manipulate molecules in three-dimensions. This is vitally important in order to study and understand the shapes adopted by particular molecules.  \n1.2 OBJECTIVES  \n• To investigate shapes of molecules by analysing experimental crystal structure data.  \n• To understand the factors that determine the preferred shape adopted by particular molecules.  \n• To use the valence-shell electron-pair repulsion (VSEPR) model to predict the shapes of given molecules.  \n1.3 GETTING STARTED  \n• Open the interactive WebCSD teaching database by going to the following URL: [http://webcsd.ccdc.cam.ac.uk/teaching_database_demo.php](http://webcsd.ccdc.cam.ac.uk/teaching_database_demo.php)  \n• This demo version of WebCSD allows you to browse all 500 entries in the teaching subset of the Cambrdige Structrual Database.  \n• Reference codes (refcodes) of the structures in the teaching set will appear in a list on the lefthand side of the WebCSD page. Only those refocde beginning with “A” are displayed intially. To show those refcodes starting with “B” click on the > button.  \n• To view a structure select the corresponding refcode in the list by left-clicking on it. Alternatively, you can type a refocde in the Entry box above the structure list.  \n1.4 STEPS REQUIRED  \n1.4.1 Examine the structures of di-, tri-, and tetrachloro mercury  \n• Consider the following series of molecules: HgCl2 , HgCl3-, and HgCl42-as we move across the series we are successively adding a Cl to the central Hg atom. For each structure how would you expect the Cl atoms to arrange themselves around the Hg atom? Sketch each of the structures to show the shape of the molecule you predict.  \n• Check you answers by inspecting the corresponding crystal structures. The following structures  \nCSDS Teaching Module: Shapes of Molecules © CCDC  \nare provided: HgCl2 (refcode OKAJOZ), HgCl3- (refcode KUSMAM), and HgCl42- (refcode KEYZUK). To display a structure type it’s reference code (refcode) in the Entry box above the structure list on the left hand side of the WebCSD page:  \nTo manipulate structures in the 3D viewer:  \n1. Structures can be rotated by moving the cursor in the display area while keeping the left-hand mouse button pressed down.  \n2. To zoom in and out move the cursor up and down in the display area while keeping both the shift key and the left-hand mouse button pressed down.  \n3. To translate structures move the cursor in the display area while keeping both the left-hand mouse button and the keyboard Ctrl key pressed down.  \n4. At any stage the display area can be returned to the default view by hitting the r button on the keyboard.  \n• Do the shapes ofthe experimentally determined structures agree with your predictions? For each of the three structures measure the Cl-Hg-Cl bond angles in the structure. What does this tell you about the observed geometries?  \nTo measure geometric parameters in the 3D viewer:  \n1. Select the type of measurment you wish to make by right-clicking within the 3D viewer and selecting Measure, followed by either Distances, Angles or Torsions  \n2 CSD Teaching Module: Shapes of Molecules © CCDC  \n2. Geometrical measurements (intramolecular or intermolecular) can now be made by clicking one.g., two atoms for a distance, three atoms for an angle or four atoms for a torsion angle.  \n3. To remove all geometrical measurements from the display right-click within the 3D viewer and select Measure, followed by either Clear distances, Clear angles or Clear torsions.  \n• HgCl2 is linear with bonds angles of 180 deg., HgCl3-exists in a trigon","cbCaiixKKi0l38a4","https://ap.wps.com/l/cbCaiixKKi0l38a4","pdf",392260,10,"English","# Shapes of Molecules: VSEPR Model\n## Introduction\n## Objectives\n## Getting Started\n## Steps Required\n## The VSEPR model\n## Apply the VSEPR model to predict basic shape","[{\"question\":\"What does the VSEPR model use to predict molecular shape?\",\"answer\":\"It assumes that bonding pairs, lone pairs, and multiple bonds occupy positions as far apart as possible to minimize electron-electron repulsion, producing a minimum-energy arrangement.\"},{\"question\":\"Which WebCSD teaching database resources are used in this module?\",\"answer\":\"Learners use the interactive WebCSD teaching database demo to browse entries in the teaching subset and view crystal structure geometries using reference codes (refcodes).\"},{\"question\":\"How do the predicted shapes for HgCl2, HgCl3-, and HgCl42- differ?\",\"answer\":\"HgCl2 is predicted to be linear with a Cl-Hg-Cl angle of 180°, HgCl3- is trigonal planar with angles near 120°, and HgCl42- is tetrahedral with bond angles approaching 109.5°; students then measure angles to compare with experimental geometries.\"}]","SHAPES OF MOLECULES - VSEPR MODEL - Introduction - Objectives - Getting Started | PDF",1791808026]