{"id":757953,"date":"2025-02-14T09:22:58","date_gmt":"2025-02-14T03:52:58","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=757953"},"modified":"2025-06-25T13:01:22","modified_gmt":"2025-06-25T07:31:22","slug":"class-9-chemistry-structure-of-the-atom-worksheet","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/worksheets-class-9-chemistry\/structure-of-the-atom\/","title":{"rendered":"Class 9 Chemistry Structure of the Atom Worksheet"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_37 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><label for=\"item\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input type=\"checkbox\" id=\"item\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' style='display:block'><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/infinitylearn.com\/surge\/worksheets-class-9-chemistry\/structure-of-the-atom\/#What_is_an_Atom\" title=\"What is an Atom?\">What is an Atom?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/infinitylearn.com\/surge\/worksheets-class-9-chemistry\/structure-of-the-atom\/#Important_Atomic_Theories\" title=\"Important Atomic Theories\">Important Atomic Theories<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/infinitylearn.com\/surge\/worksheets-class-9-chemistry\/structure-of-the-atom\/#Why_is_the_Study_of_Atoms_Important\" title=\"Why is the Study of Atoms Important?\">Why is the Study of Atoms Important?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/infinitylearn.com\/surge\/worksheets-class-9-chemistry\/structure-of-the-atom\/#Worksheet_for_Class_9_Chemistry_Structure_of_the_Atom\" title=\"Worksheet for Class 9 Chemistry Structure of the Atom\">Worksheet for Class 9 Chemistry Structure of the Atom<\/a><\/li><\/ul><\/nav><\/div>\n<p><strong><a href=\"https:\/\/infinitylearn.com\/surge\/chemistry\/structure-of-atom\/\">Atoms<\/a> <\/strong>are the building blocks of all matter. Everything around us, from the air we breathe to the food we eat, is made up of atoms. Understanding the structure of the atom helps us learn how substances combine, react, and form new materials. In this worksheet, we will explore the different parts of an atom, important theories, and some basic calculations related to atomic structure.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_is_an_Atom\"><\/span>What is an Atom?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>An atom is the smallest unit of matter that cannot be divided further by chemical means. Each atom consists of three main particles: <strong>protons, neutrons, and electrons<\/strong>. These particles determine the properties and behavior of an atom.<\/p>\n<ul>\n<li><strong>Protons<\/strong> are positively charged particles found in the nucleus (center of the atom).<\/li>\n<li><strong>Neutrons<\/strong> have no charge and are also found in the <strong>nucleus<\/strong>.<\/li>\n<li><strong>Electrons<\/strong> are negatively charged particles that move around the nucleus in energy levels or shells.<\/li>\n<\/ul>\n<p>The number of protons in an atom is called its <strong>atomic number<\/strong>, and the total number of protons and neutrons together is called the <strong>mass number<\/strong>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Important_Atomic_Theories\"><\/span>Important Atomic Theories<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Scientists have studied atoms for many years, and different models have been proposed to explain their structure. Some important theories include:<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\n<li><strong><a href=\"https:\/\/infinitylearn.com\/surge\/chemistry\/daltons-atomic-theory\/\">Dalton\u2019s Atomic Theory<\/a> (1808)<\/strong> \u2013 John Dalton stated that all matter is made of tiny, indivisible atoms, and each element has identical atoms.<\/li>\n<li><strong><a href=\"https:\/\/infinitylearn.com\/blog\/thomson-atomic-models\">Thomson\u2019s Model<\/a> (1897)<\/strong> \u2013 J.J. Thomson discovered electrons and proposed the &#8220;plum pudding model,&#8221; where negatively charged electrons were spread in a positive sphere.<\/li>\n<li><strong><a href=\"https:\/\/infinitylearn.com\/surge\/chemistry\/rutherfords-nuclear-model\/\">Rutherford\u2019s Model<\/a> (1911)<\/strong> \u2013 Ernest Rutherford found that the nucleus is dense and positively charged, with electrons moving around it.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\n<li><strong>Bohr\u2019s Model (1913)<\/strong> \u2013 Niels Bohr suggested that electrons move in fixed orbits (shells) around the nucleus.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<ol>\n<li><strong>Modern Quantum Model<\/strong> \u2013 This model explains that electrons move in specific energy levels but their exact location cannot be determined.<\/li>\n<\/ol>\n<h2><span class=\"ez-toc-section\" id=\"Why_is_the_Study_of_Atoms_Important\"><\/span>Why is the Study of Atoms Important?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Understanding atoms helps us in many fields of science, such as chemistry, physics, and biology. It explains why substances react, how elements form compounds, and even how electricity works.<\/p>\n<p>This worksheet will help students practice questions on atomic structure, including calculating atomic and mass numbers, identifying subatomic particles, and understanding atomic models. By solving these exercises, students will build a strong foundation in chemistry and develop problem-solving skills.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Worksheet_for_Class_9_Chemistry_Structure_of_the_Atom\"><\/span>Worksheet for Class 9 Chemistry Structure of the Atom<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Ques 1.<\/strong> Who discovered the neutron?<\/p>\n<p>a) Niels Bohr<br \/>\nb) J. Chadwick<br \/>\nc) J.J. Thomson<br \/>\nd) E. Goldstein<\/p>\n<p><strong>Ques 2.<\/strong> What does Rutherford\u2019s gold foil experiment tell us about atoms?<\/p>\n<p>a) Most of an atom is empty space.<br \/>\nb) Electrons move in fixed circular orbits.<br \/>\nc) The center of an atom is small and dense.<br \/>\nd) Most of an atom\u2019s mass is in the nucleus.<\/p>\n<p><strong>Ques 3.<\/strong> The atomic mass of an element is twice its atomic number. If the L-shell has six electrons:<\/p>\n<p>a) What is its valency?<br \/>\nb) Identify the element.<\/p>\n<p><strong>Ques 4.<\/strong> Which of these statements about a proton is incorrect?<\/p>\n<p>a) It has a positive charge.<br \/>\nb) It has the same mass as a neutron.<br \/>\nc) It is found in the nucleus of an atom.<br \/>\nd) It is part of cathode rays.<\/p>\n<p><strong>Ques 5.<\/strong> An atom has a mass number of 39 and contains 20 neutrons. What is its atomic number?<\/p>\n<p><strong>Ques 6.<\/strong> What are the electronic configurations of the following ions?<\/p>\n<p>i) H\u2013<br \/>\nii) S\u00b2\u207b<br \/>\niii) N\u207b\u00b9<br \/>\niv) N\u00b2\u207a<\/p>\n<p><strong>Ques 7.<\/strong> What did Niels Bohr propose to improve Rutherford\u2019s atomic model?<\/p>\n<p><strong>Ques 8.<\/strong> Which atomic property was correctly explained by Thomson\u2019s model of the atom?<\/p>\n<p>a) Atom stability<br \/>\nb) Hydrogen atom spectrum<br \/>\nc) Overall neutrality of an atom<br \/>\nd) Placement of electrons, protons, and neutrons in an atom<\/p>\n<p><strong>Ques 9.<\/strong> How many nucleons are in an Americium (Am) atom with atomic number 95 and mass number 243? Also, how many electrons and neutrons does it have?<\/p>\n<p><strong>Ques 10.<\/strong> Fill in the blanks:<\/p>\n<p>a) The weighted average of all natural isotopes&#8217; masses is called an atom\u2019s _________.<br \/>\nb) The number of _______ in the nucleus equals the number of _______ in a neutral atom.<br \/>\nc) The _______ contains most of an atom\u2019s mass.<br \/>\nd) The highest number of protons and neutrons in a hydrogen isotope is ________.<br \/>\ne) Inside an atom, only certain special orbits called _______ are allowed for electrons.<\/p>\n<p><strong>Ques 11.<\/strong> Which pair of elements has the same number of electrons in the outermost shell?<\/p>\n<p>a) Na, Mg<br \/>\nb) Zn, Fe<br \/>\nc) Pn, Sb<br \/>\nd) K, Rb<\/p>\n<p><strong>Ques 12.<\/strong> The arrangement of electrons in different atomic shells was suggested by:<\/p>\n<p>a) John Dalton<br \/>\nb) Bohr and Bury<br \/>\nc) Henry Moseley<br \/>\nd) Rutherford<\/p>\n<p><strong>Ques 13.<\/strong> The correct statement about electron configuration is:<\/p>\n<p>a) It shows which orbitals are occupied rather than how many there are.<br \/>\nb) It represents only the outer electrons of an atom.<br \/>\nc) It shows exactly which orbitals electrons occupy.<br \/>\nd) The shape of orbitals is determined by electron configuration.<\/p>\n<p><strong>Ques 14.<\/strong> Isobars are atoms that:<\/p>\n<p>a) Have the same mass number but different atomic numbers.<br \/>\nb) Have the same number of protons but different electrons.<br \/>\nc) Have the same number of protons and electrons.<br \/>\nd) Have the same atomic number but different mass numbers.<\/p>\n<p><strong>Ques 15.<\/strong> Why did Rutherford use gold foil for his alpha particle experiment?<\/p>\n<p><strong>Ques 16.<\/strong> Boron exists naturally as two isotopes with atomic masses of 10.01 and 11.01. If boron\u2019s average atomic mass is 10.81, what is the percentage of each isotope?<\/p>\n<p><strong>Ques 17.<\/strong> Write the electron arrangement for argon and phosphorus. Also, if K and M shells contain 2 and 8 electrons, how many are in the L shell?<\/p>\n<p><strong>Ques 18.<\/strong> Which subatomic particle determines the identity of an element?<\/p>\n<p>a) Electron<br \/>\nb) Neutron<br \/>\nc) Proton<br \/>\nd) Electron + Proton<\/p>\n<p><strong>Ques 19.<\/strong> The symbols <strong>\u00b9\u2077\u2083\u2085Cl<\/strong> and <strong>\u00b3\u2075Cl<\/strong> are correct, while <strong>\u00b3\u2075\u2081\u2087Cl<\/strong> and <strong>\u00b3\u2075Cl<\/strong> are not. Why?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Atoms are the building blocks of all matter. Everything around us, from the air we breathe to the food we [&hellip;]<\/p>\n","protected":false},"author":53,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"Class 9 Chemistry Structure of the Atom Worksheet","_yoast_wpseo_title":"Class 9 Chemistry Structure of the Atom Worksheet with Answers | Infinity Learn","_yoast_wpseo_metadesc":"Download a free Class 9 Chemistry Structure of the Atom worksheet with answers. 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