[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-207990-en":3,"doc-seo-207990-105":30,"detail-sidebar-cat-0-en-105":90},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":4,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":21,"language":22,"language_code":23,"site_id":24,"html_lang":23,"table_of_contents":25,"faqs":26,"seo_title":27,"seo_description":14,"update_tm":28,"read_time":29},207990,962085570644,"Melati","https://ap-avatar.wpscdn.com/davatar_994ba38a5ba835b3df7d355c54d3ed8d",4,"Exam","Edexcel GCSE Chemistry - The Periodic Table - Study Notes","Study notes for Edexcel GCSE Chemistry focused on the periodic table and how elemental ordering developed. Covers Mendeleev’s original periodic arrangement, the emergence of repeating patterns, gaps used to predict properties of undiscovered elements, and key limitations such as isotopes not yet being known. Explains why atomic number replaces atomic mass in the modern periodic table and how groups and periods relate to electron shells and outer-electron counts. Includes quick examiner tips and core concepts about metals and non-metals.","Edexcel GCSE Chemistry  \nThe Periodic Table  \nContents  \n Mendeleev ´s Periodic Table  The Modern Periodic Table  Electronic Configurations  \nYour notes  \nMendeleev ´sPeriodic Table  \nMendeleev's Arrangement  \n Before the discovery of the subatomic particles, scientists struggled to find ways of ordering the growing knowledge of elements and their chemistry  \n When the elements that were known at that time were sorted by mass into a table, patterns emerged at regular periods along the table, giving rise to the term periodic  \n The earlier tables were incomplete as some elements were forced into a position to fill gaps which appeared during the sorting process  \n Other elements were placed in the wrong group as they were sorted strictly on their mass and had their chemical properties ignored  \n There were many early versions of the tables as scientists in different countries grappled with the ordering of the elements  \n In 1869 the Russian chemist Dmitri Mendeleev created his first draft of the periodic table  \n He organised the elements into vertical columns based on their properties and the properties of their compounds  \n He then started to arrange them horizontally in order of increasing atomic mass and ashe worked, he found that a pattern began to appear in which chemically similar elements fell naturally into the same columns  \nYour notes  \nMendeleev 's Periodic Table showing gaps  \n There were exceptions though as some elements didn 't fit the pattern when arranged by atomic mass  \n Mendeleev worked to include all the elements, but he didn 't force an element to fit the pattern, rather he left gaps in the table that he thought would best be filled by elements that had not yet been discovered  \n He also switched the order of the elements to maintain consistency down the columns  \nMendeleev's Predictions  \nMendeleev quickly realised that elements with the same properties should be placed in the same column  \nHe realised that gaps in the table must correspond to elements that had not yet been discovered or isolated  \nHe used the properties and trends of other elements in the group with the gap to predict the properties of these undiscovered elements  \nMendeleev left a gap between silicon and tin and used his knowledge of the properties of those two elements to make predictions about the physical and chemical properties of the undiscovered element  \nHe called this element 'eka-silicon ' which comes from the Greek ' like silicon ' and when the element germanium was discovered in 1887 it was found to almost exactly match the properties Mendeleev had predicted  \nNo one doubted that Mendeleev had got the right idea about ordering the elements  \nStrangely enough, Mendeleev always denied the existence of an eighth group of elements, even after the discovery of the noble gases in Mendeleev 's final years  \nExaminer Tipsand Tricks  \nMendeleev’stable had gaps into which he didn’t force an element, rather he left them empty to be filled at a later date when the correct element was isolated. In this way his version of the table allowed him to predict the existence and properties of thenunknown elements.  \nProblems with Mendeleev's Table  \n Once he was finished, Mendeleev thought he had organised the elements systematically but there were still some elements which didn 't quite fit in as neatly as he wanted.  \n This is because isotopes were not known in Mendeleev 's time, and he made no provisions for them in his table  \nYour notes  \nThis meant that there was always going to be some level of inaccuracy in Mendeleev  work eventhough he did also consider the elements chemical properties as well as their atomic mass when sorting them  \n Mendeleev switched the order of tellurium and iodine is histable, because eventhough tellurium was heavier than iodine, the chemistry of iodine fitted better with the other halogen elements; it was a nagging problem that was not solved in his lifetime  \n The discovery of the proton lead to the determination","cbCais0uqEjePuJY","https://ap.wps.com/l/cbCais0uqEjePuJY","pdf",825053,1,11,"English","en",105,"# The Periodic Table\n## Mendeleev's Periodic Table\n## Mendeleev's Predictions\n## Problems with Mendeleev's Table\n## The Modern Periodic Table\n## The Periodic Table of the Elements\n## Metals and Non-Metals in the Periodic Table","[{\"question\":\"Why did early scientists create periodic tables for elements?\",\"answer\":\"Scientists struggled to order rapidly growing knowledge of elements. Sorting known elements by mass revealed patterns that repeated along the table, leading to the idea of a periodic arrangement.\"},{\"question\":\"How did Mendeleev use gaps in his periodic table?\",\"answer\":\"Mendeleev left gaps where he believed undiscovered elements would fit best. He used trends in elements within the same groups to predict the properties of those future elements.\"},{\"question\":\"What changes in the modern periodic table and why does it work better?\",\"answer\":\"The discovery of the proton enabled atomic number for each element. The modern table orders elements by increasing atomic number, placing elements with similar properties into the same columns (groups), matching the observed periodic patterns more closely.\"}]","Edexcel GCSE Chemistry - The Periodic Table - Study Notes | PDF",1788602035,28,{"code":4,"msg":31,"data":32},"ok",{"site_id":24,"language":23,"slug":33,"title":13,"keywords":34,"description":14,"schema_data":35,"social_meta":85,"head_meta":87,"extra_data":89,"updated_unix":28},"edexcel-gcse-chemistry-the-periodic-table-study-notes","",{"@graph":36,"@context":84},[37,53,67],{"@type":38,"itemListElement":39},"BreadcrumbList",[40,44,48,51],{"item":41,"name":42,"@type":43,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":45,"name":46,"@type":43,"position":47},"https://docshare.wps.com/document/","Document",2,{"item":49,"name":12,"@type":43,"position":50},"https://docshare.wps.com/document/exam/",3,{"item":52,"name":13,"@type":43,"position":11},"https://docshare.wps.com/document/edexcel-gcse-chemistry-the-periodic-table-study-notes/207990/",{"url":52,"name":13,"@type":54,"author":55,"headline":13,"publisher":57,"fileFormat":60,"inLanguage":23,"description":14,"dateModified":61,"datePublished":61,"encodingFormat":60,"isAccessibleForFree":62,"interactionStatistic":63},"DigitalDocument",{"name":9,"@type":56},"Person",{"url":41,"name":58,"@type":59},"DocShare","Organization","application/pdf","2026-09-05",true,{"@type":64,"interactionType":65,"userInteractionCount":4},"InteractionCounter",{"@type":66},"ViewAction",{"@type":68,"mainEntity":69},"FAQPage",[70,76,80],{"name":71,"@type":72,"acceptedAnswer":73},"Why did early scientists create periodic tables for elements?","Question",{"text":74,"@type":75},"Scientists struggled to order rapidly growing knowledge of elements. Sorting known elements by mass revealed patterns that repeated along the table, leading to the idea of a periodic arrangement.","Answer",{"name":77,"@type":72,"acceptedAnswer":78},"How did Mendeleev use gaps in his periodic table?",{"text":79,"@type":75},"Mendeleev left gaps where he believed undiscovered elements would fit best. He used trends in elements within the same groups to predict the properties of those future elements.",{"name":81,"@type":72,"acceptedAnswer":82},"What changes in the modern periodic table and why does it work better?",{"text":83,"@type":75},"The discovery of the proton enabled atomic number for each element. The modern table orders elements by increasing atomic number, placing elements with similar properties into the same columns (groups), matching the observed periodic patterns more closely.","https://schema.org",{"og:url":52,"og:type":86,"og:title":13,"og:site_name":58,"og:description":14},"article",{"robots":88,"canonical":52},"index,follow",{"doc_id":7,"site_id":24},{"code":4,"msg":5,"data":91},[92,96,100,103,108,113,118,123,128,131,135],{"id":20,"doc_module":4,"doc_module_name":46,"category_name":93,"show_sort_weight":94,"slug":95},"Story & Novel",90,"story-novel",{"id":47,"doc_module":4,"doc_module_name":46,"category_name":97,"show_sort_weight":98,"slug":99},"Literature",80,"literature",{"id":11,"doc_module":4,"doc_module_name":46,"category_name":12,"show_sort_weight":101,"slug":102},70,"exam",{"id":104,"doc_module":4,"doc_module_name":46,"category_name":105,"show_sort_weight":106,"slug":107},5,"Comic",60,"comic",{"id":109,"doc_module":4,"doc_module_name":46,"category_name":110,"show_sort_weight":111,"slug":112},6,"Technology",50,"technology",{"id":114,"doc_module":4,"doc_module_name":46,"category_name":115,"show_sort_weight":116,"slug":117},7,"Healthcare",40,"healthcare",{"id":119,"doc_module":4,"doc_module_name":46,"category_name":120,"show_sort_weight":121,"slug":122},8,"Research & Report",30,"research-report",{"id":124,"doc_module":4,"doc_module_name":46,"category_name":125,"show_sort_weight":126,"slug":127},9,"Religion & Spirituality",20,"religion-spirituality",{"id":126,"doc_module":4,"doc_module_name":46,"category_name":129,"show_sort_weight":126,"slug":130},"World Cup","world-cup",{"id":132,"doc_module":4,"doc_module_name":46,"category_name":133,"show_sort_weight":132,"slug":134},10,"Lifestyle","lifestyle",{"id":136,"doc_module":4,"doc_module_name":46,"category_name":137,"show_sort_weight":104,"slug":138},19,"General","general"]