[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-207993-en":3,"doc-seo-207993-105":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},207993,2336475104736,"วิน","https://ap-avatar.wpscdn.com/avatar/22000c4c5e0e5b17e70?x-image-process=image/resize,m_fixed,w_180,h_180&k=1786591360781797222",4,"Exam","WJEC GCSE Chemistry - Combined Science - Atomic Structure & The Periodic Table","Revision notes for WJEC GCSE Chemistry (Combined Science) focusing on atomic structure and how atoms relate to the periodic table. Covers definitions and roles of protons, neutrons, electrons, and the nucleus, including atomic vs relative atomic mass and charge concepts. Explains how ions form via electron loss or gain, then links atomic number and mass number (Z and A) to element identity and neutron count. Includes isotope notation and highlights common exam confusions with targeted worked examples.","Head to www.savemyexams. com for more awesome resources  \n WJEC GCSE Chemistry: Combined Science  \nAtomic Structure & The Periodic Table  \nContents  \n Atomic Structure  \n Atomic Number, Mass Number & Isotopes  The Periodic Table  \n Electronic Structure  \n Trends in the Periodic Table  Reactions of Alkali Metals  Testing for Hydrogen Gas  Reactions of Halogens  Group 0 Gases  \n Testing Cations & Anions  \nPage 1 of 43  \n© 2015 − 2024 Save My Exams, Ltd. · Revision Notes, Topic Questions, Past Papers  \nYour notes  \nHead to www.savemyexams. com for more awesome resources  \nAtomic Structure  \nAtomic Structure  \n All substances are made of tiny particles of matter called atoms which are the building blocks of all matter  \n Each atom is made of subatomic particles called protons, neutrons, and electrons  \n The protons and neutrons are located atthe centre of the atom, which is called the nucleus  \n The nucleus is positively charged  \n The electrons move very fast around the nucleus in orbital paths called shells  \n The mass of the electron is negligible, hence the mass of an atom is contained within the nucleus where the protons and neutrons are located  \nAtomic Structure Diagram  \nThe structure of the carbon atom  \n Examiner Tip  \nThe atom isthe smallest part of an element that exists eventhough it can be divided into smaller particles.  \nThis is because the atom is the smallest part of an element that still retains the properties of the element-the subatomic particles do not.  \nPage 2 of 43  \n© 2015 − 2024 Save My Exams, Ltd. · Revision Notes, Topic Questions, Past Papers  \nYour notes  \nHead to www.savemyexams. com for more awesome resources  \nRelative Masses  \n The protons, neutrons and electrons that an atom is made up of are called subatomic particles  \n These subatomic particles are so small that it is not practical to measure their masses and charges using conventional units (such as grams or coulombs)  \n Instead, their masses and charges are compared to each other, and so are called ‘relative atomic masses’ and ‘relative atomic charges’  \n These are not actual charges and masses, but rather charges and masses of particles relative to eachother  \n Protons and neutrons have avery similar mass, so each is assigned a relative mass of 1  \n Electrons are 2000 times smaller than a proton and neutron, and so their mass is often described as being negligible  \n The relative mass and charge of the subatomic particles are:  \nThe Mass & Charge of Subatomic Particles Table  \n\n| Particle | Relative Mass | Charge |\n| --- | --- | --- |\n| Proton | 1 | +1 |\n| Neutron | 1 | 0 (neutral) |\n| Electron | 1/2000 | -1 |\n\n Atoms are electrically neutral  \n This is achieved by having the same number of electrons as protons  \n The negative charge of an electron exactly cancels out the positive charge of a proton  \n An ion is formed when an atom loses or gains electrons to achieve a full outer shell  \n If an atom loses electrons, it forms positively charged ions  \n If an atom gains electrons, it forms negatively charged ions  \nPage 3 of 43  \n© 2015 − 2024 Save My Exams, Ltd. · Revision Notes, Topic Questions, Past Papers  \nYour notes  \nHead to www.savemyexams. com for more awesome resources  \n Worked example  \nExplain why a magnesium ion has a 2+ charge.  \nAnswer:  \n A magnesium atom has 12 positively charged protons and 12 negatively charged electrons  \n To gain a full outer shell magnesium loses two electrons  \n It now has 12 protons but only 10 electrons  \n The overall charge is 2+  \n Examiner Tip  \nThe mass of an electron can just be stated as 'almost zero ' in an exam.  \nPage 4 of 43  \n© 2015 − 2024 Save My Exams, Ltd. · Revision Notes, Topic Questions, Past Papers  \nYour notes  \nHead to www.savemyexams. com for more awesome resources  \nAtomic Number, Mass Number & Isotopes  \nAtomic Number, Mass Number & Isotopes Atomic Number  \n The atomic number (or proton number) is the number of protons in the nucleus of an atom  \n The symbol for this number is ","cbCaiqbCL39ovpE8","https://ap.wps.com/l/cbCaiqbCL39ovpE8","pdf",5805009,1,43,"English","en",105,"# Atomic Structure\n## Atomic Number, Mass Number & Isotopes\n## Relative Masses\n## Worked example\n# Atomic Structure\n## Relative Masses\n## Atomic Number, Mass Number & Isotopes","[{\"question\":\"What is atomic structure and what particles make up an atom?\",\"answer\":\"Atoms are made of protons, neutrons, and electrons. Protons and neutrons are in the nucleus, while electrons move around it in shells.\"},{\"question\":\"How are relative atomic masses and charges used in chemistry?\",\"answer\":\"Particle masses and charges are compared to each other, giving relative atomic masses and relative atomic charges. Protons and neutrons are assigned a relative mass of 1, while electrons have a mass of about 1/2000 and a charge of −1.\"},{\"question\":\"What is the difference between atomic number and mass number, and how do isotopes relate to them?\",\"answer\":\"Atomic number is the number of protons (Z) and fixes the element. Mass number is the total protons and neutrons (A), so neutrons equal A − Z. Isotopes have the same protons and electrons but different numbers of neutrons, shown using notation like C-14 or 14C.\"}]","WJEC GCSE Chemistry - Combined Science - Atomic Structure & The Periodic Table | PDF",1788602038,108,{"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},"wjec-gcse-chemistry-combined-science-atomic-structure-the-periodic-table","",{"@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/wjec-gcse-chemistry-combined-science-atomic-structure-the-periodic-table/207993/",{"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},"What is atomic structure and what particles make up an atom?","Question",{"text":74,"@type":75},"Atoms are made of protons, neutrons, and electrons. Protons and neutrons are in the nucleus, while electrons move around it in shells.","Answer",{"name":77,"@type":72,"acceptedAnswer":78},"How are relative atomic masses and charges used in chemistry?",{"text":79,"@type":75},"Particle masses and charges are compared to each other, giving relative atomic masses and relative atomic charges. Protons and neutrons are assigned a relative mass of 1, while electrons have a mass of about 1/2000 and a charge of −1.",{"name":81,"@type":72,"acceptedAnswer":82},"What is the difference between atomic number and mass number, and how do isotopes relate to them?",{"text":83,"@type":75},"Atomic number is the number of protons (Z) and fixes the element. Mass number is the total protons and neutrons (A), so neutrons equal A − Z. Isotopes have the same protons and electrons but different numbers of neutrons, shown using notation like C-14 or 14C.","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"]