{"id":300423,"date":"2026-04-17T17:03:05","date_gmt":"2026-04-17T11:33:05","guid":{"rendered":"https:\/\/www.aakash.ac.in\/blog\/?p=300423"},"modified":"2026-04-17T17:03:05","modified_gmt":"2026-04-17T11:33:05","slug":"structure-of-atom-for-neet-notes","status":"publish","type":"post","link":"https:\/\/www.aakash.ac.in\/blog\/structure-of-atom-for-neet-notes\/","title":{"rendered":"Structure of Atom for NEET 2026: Complete Notes, Atomic Structures and Key Concepts"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">The <\/span><b>structure of atom<\/b><span style=\"font-weight: 400;\"> is one of the most foundational chapters in NEET Chemistry. It contributes approximately 2 to 3 questions per paper, accounting for around 4% of the Chemistry section.\u00a0<\/span><\/p>\n<p>The team at Aakash has carefully reviewed the NEET 2026 syllabus and past question trends to put together this complete guide on structure of atom for NEET. From the history of atomic models to quantum numbers and electron configurations, here is everything you need to know.<\/p>\n<h2><b>Who Invented the Structure of Atom? A Quick Historical Overview<\/b><\/h2>\n<p>Understanding who invented structure of atom is not just trivia; it forms the backbone of the conceptual section of this chapter. Each model built upon the limitations of the previous one. The timeline below captures the key contributors:<\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Scientist<\/b><\/td>\n<td><b>Year<\/b><\/td>\n<td><b>Model \/ Contribution<\/b><\/td>\n<td><b>Key Limitation<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">John Dalton<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1803<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Atoms are indivisible solid spheres<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Could not explain subatomic particles<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">J.J. Thomson<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1898<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Plum pudding model: electrons embedded in positive sphere<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Could not explain scattering of alpha particles<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Ernest Rutherford<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1911<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Nuclear model: dense positive nucleus with orbiting electrons<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Could not explain why electrons do not spiral into the nucleus<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Niels Bohr<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1913<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Electrons revolve in fixed quantised orbits without losing energy<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Could not explain spectra of multi-electron atoms or Zeeman effect<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Quantum Mechanical Model<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1920s<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Electrons exist in probability regions called orbitals<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Currently accepted model; most accurate description<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><a style=\"display: inline-block; padding: 12px 22px; background: #1a73e8; color: #ffffff; text-decoration: none; font-size: 16px; font-weight: 600; border-radius: 6px;\" href=\"https:\/\/www.aakash.ac.in\/neet-chemistry-syllabus\">NEET Chemistry Syllabus 2026 <\/a><\/p>\n<h2><b>Atomic Structure of Carbon, Hydrogen, Oxygen and Sodium for NEET<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">NEET frequently tests the electronic configuration and subatomic composition of common elements. Knowing the <\/span><b>atomic structure of hydrogen<\/b><span style=\"font-weight: 400;\">, <\/span><b>atomic structure of carbon<\/b><span style=\"font-weight: 400;\">, <\/span><b>atomic structure of oxygen<\/b><span style=\"font-weight: 400;\">, and <\/span><b>atomic structure of sodium<\/b><span style=\"font-weight: 400;\"> is essential for both direct questions and application-based problems.<\/span><\/p>\n<p>&nbsp;<\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Element<\/b><\/td>\n<td><b>Atomic Number (Z)<\/b><\/td>\n<td><b>Protons<\/b><\/td>\n<td><b>Neutrons (most common isotope)<\/b><\/td>\n<td><b>Electrons<\/b><\/td>\n<td><b>Electronic Configuration<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Hydrogen (H)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1s1<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Carbon (C)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">6<\/span><\/td>\n<td><span style=\"font-weight: 400;\">6<\/span><\/td>\n<td><span style=\"font-weight: 400;\">6<\/span><\/td>\n<td><span style=\"font-weight: 400;\">6<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1s2 2s2 2p2<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Oxygen (O)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">8<\/span><\/td>\n<td><span style=\"font-weight: 400;\">8<\/span><\/td>\n<td><span style=\"font-weight: 400;\">8<\/span><\/td>\n<td><span style=\"font-weight: 400;\">8<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1s2 2s2 2p4<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Sodium (Na)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">11<\/span><\/td>\n<td><span style=\"font-weight: 400;\">11<\/span><\/td>\n<td><span style=\"font-weight: 400;\">12<\/span><\/td>\n<td><span style=\"font-weight: 400;\">11<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1s2 2s2 2p6 3s1<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">The <\/span><b>atomic structure of hydrogen<\/b><span style=\"font-weight: 400;\"> is unique as it has no neutrons in its most common isotope (protium) and is the only element for which Bohr&#8217;s model gives accurate energy levels. The <\/span><b>atomic structure of sodium<\/b><span style=\"font-weight: 400;\"> makes it highly reactive due to its single valence electron in the 3s subshell, which it readily loses to form Na+.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The <\/span><b>atomic structure of carbon<\/b><span style=\"font-weight: 400;\"> with four valence electrons allows it to form four bonds, making it the foundation of organic chemistry.<\/span><\/p>\n<p><a style=\"display: inline-block; padding: 12px 22px; background: #1a73e8; color: #ffffff; text-decoration: none; font-size: 16px; font-weight: 600; border-radius: 6px;\" href=\"https:\/\/www.aakash.ac.in\/neet-syllabus\">NEET Syllabus 2026 <\/a><\/p>\n<h2><b>Structure of Atom for NEET: Core Concepts and Formulae<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The following table summarises the most important concepts and formulae tested in <\/span><b>structure of atom for NEET<\/b><span style=\"font-weight: 400;\">. These are frequently paired with numerical problems in the exam.<\/span><\/p>\n<p>&nbsp;<\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Concept<\/b><\/td>\n<td><b>Key Formula \/ Rule<\/b><\/td>\n<td><b>NEET Relevance<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Bohr&#8217;s Energy Formula<\/span><\/td>\n<td><span style=\"font-weight: 400;\">En = -13.6 x Z2\/n2 eV<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Used to calculate energy of electron in nth orbit of hydrogen-like atoms<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">de Broglie&#8217;s Relation<\/span><\/td>\n<td><span style=\"font-weight: 400;\">lambda = h\/mv<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Links wave nature of matter to momentum; common source of numericals<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Heisenberg&#8217;s Uncertainty Principle<\/span><\/td>\n<td><span style=\"font-weight: 400;\">delta-x x delta-p &gt;= h\/4pi<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Conceptual questions on why exact position and momentum cannot be known simultaneously<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Angular Momentum (Bohr)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">mvr = nh\/2pi<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Quantisation of angular momentum in Bohr orbits<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Maximum electrons in a shell<\/span><\/td>\n<td><span style=\"font-weight: 400;\">2n2<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Used to determine electron capacity of K, L, M, N shells<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Aufbau Principle<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Fill lower energy orbitals first<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Governs order of orbital filling: 1s, 2s, 2p, 3s, 3p, 4s, 3d&#8230;<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Pauli&#8217;s Exclusion Principle<\/span><\/td>\n<td><span style=\"font-weight: 400;\">No two electrons can have all four quantum numbers identical<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Key rule for electron pairing in orbitals<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Hund&#8217;s Rule<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Electrons occupy orbitals singly before pairing<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Determines ground state electronic configuration<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b>Structure of Atom for NEET: The Four Quantum Numbers<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Quantum numbers define the state of an electron in an atom. Questions on quantum numbers appear almost every year in <\/span><b>structure of atom for NEET<\/b><span style=\"font-weight: 400;\">. Understanding what each number represents is critical.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Quantum Number<\/b><\/td>\n<td><b>Symbol<\/b><\/td>\n<td><b>What It Defines<\/b><\/td>\n<td><b>Possible Values<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Principal<\/span><\/td>\n<td><span style=\"font-weight: 400;\">n<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Energy level \/ shell size<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1, 2, 3, 4&#8230; (positive integers)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Azimuthal (Angular Momentum)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">l<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Shape of orbital \/ subshell<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0 to n-1 (s=0, p=1, d=2, f=3)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Magnetic<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ml<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Orientation of orbital in space<\/span><\/td>\n<td><span style=\"font-weight: 400;\">-l to 0 to +l<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Spin<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ms<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Spin of electron<\/span><\/td>\n<td><span style=\"font-weight: 400;\">+1\/2 or -1\/2<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b>What is the Atomic Packing Factor of BCC Structure?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The question of <\/span><b>what is the atomic packing factor of the bcc structure<\/b><span style=\"font-weight: 400;\"> occasionally appears at the boundary of the atomic structure chapter and solid-state chemistry. The Body-Centred Cubic (BCC) structure has an <\/span><b>atomic packing factor (APF) of 0.68<\/b><span style=\"font-weight: 400;\">, meaning 68% of the unit cell volume is occupied by atoms.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Crystal Structure<\/b><\/td>\n<td><b>Atoms per Unit Cell<\/b><\/td>\n<td><b>Atomic Packing Factor (APF)<\/b><\/td>\n<td><b>Examples<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Simple Cubic (SC)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.52 (52%)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Polonium<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Body-Centred Cubic (BCC)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">2<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.68 (68%)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Iron, Sodium, Chromium<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Face-Centred Cubic (FCC)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">4<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.74 (74%)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Copper, Aluminium, Gold<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">The APF for BCC is derived from the relationship between the atomic radius and the unit cell edge length, where r = (sqrt(3)\/4) x a. This distinction between crystal structures is directly testable in NEET Chemistry.<\/span><\/p>\n<h2><b>Hydrogen Spectrum and Spectral Series: A Must-Know for Structure of Atom NEET<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The <\/span><b>atomic structure of hydrogen<\/b><span style=\"font-weight: 400;\"> gives rise to distinct spectral series, all of which are testable in <a href=\"https:\/\/www.aakash.ac.in\/neet-exam\">NEET Exam<\/a>. Each series corresponds to electron transitions ending at a specific energy level.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Spectral Series<\/b><\/td>\n<td><b>Electron Transition Ends At (n =)<\/b><\/td>\n<td><b>Region of Spectrum<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Lyman Series<\/span><\/td>\n<td><span style=\"font-weight: 400;\">n = 1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ultraviolet (UV)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Balmer Series<\/span><\/td>\n<td><span style=\"font-weight: 400;\">n = 2<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Visible light<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Paschen Series<\/span><\/td>\n<td><span style=\"font-weight: 400;\">n = 3<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Infrared (near)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Brackett Series<\/span><\/td>\n<td><span style=\"font-weight: 400;\">n = 4<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Infrared (mid)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Pfund Series<\/span><\/td>\n<td><span style=\"font-weight: 400;\">n = 5<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Infrared (far)<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The Balmer series is the most commonly tested in NEET because it falls in the visible region. The formula n1 = 2, n2 = 3 gives a wavelength of approximately 656 nm (red light), which is a frequently asked numerical.<\/p>\n<h2><b>Structure of Atom for NEET 2026: Weightage and High-Yield Topics<\/b><\/h2>\n<table>\n<tbody>\n<tr>\n<td><b>Topic<\/b><\/td>\n<td><b>Frequency in NEET (Past 5 Years)<\/b><\/td>\n<td><b>Priority Level<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Bohr&#8217;s model and energy calculations<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Very High<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Must prepare<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Quantum numbers and orbital shapes<\/span><\/td>\n<td><span style=\"font-weight: 400;\">High<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Must prepare<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Electronic configuration and exceptions<\/span><\/td>\n<td><span style=\"font-weight: 400;\">High<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Must prepare<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Photoelectric effect<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Moderate<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Important<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">de Broglie wavelength numericals<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Moderate<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Important<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Heisenberg&#8217;s uncertainty principle<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Moderate<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Important<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Hydrogen spectral series<\/span><\/td>\n<td><span style=\"font-weight: 400;\">High<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Must prepare<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Aufbau, Pauli, Hund&#8217;s rules<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Moderate<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Important<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b>Wrapping Up<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The <\/span><b>structure of atom for NEET<\/b><span style=\"font-weight: 400;\"> is a scoring chapter that rewards systematic preparation. Master the atomic models in order, understand the <\/span><b>atomic structure of hydrogen<\/b><span style=\"font-weight: 400;\">, <\/span><b>atomic structure of carbon<\/b><span style=\"font-weight: 400;\">, <\/span><b>atomic structure of sodium<\/b><span style=\"font-weight: 400;\">, and <\/span><b>atomic structure of oxygen<\/b><span style=\"font-weight: 400;\">, and practise numericals on Bohr&#8217;s formula and de Broglie&#8217;s equation regularly.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">With the NEET 2026 exam scheduled for <\/span><b>3 May 2026<\/b><span style=\"font-weight: 400;\">, this chapter offers consistent, predictable marks that you should not leave to chance.<\/span><\/p>\n<h2><b>FAQs<\/b><\/h2>\n\t\t<div class=\"wp-faq-schema-wrap\">\n\t\t\t\t\t\t<div class=\"wp-faq-schema-items\">\n\t\t\t\t\t\t\t\t\t<h3>Q1. Who invented the structure of atom?<\/h3>\n\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<p>Multiple scientists contributed. J.J. Thomson discovered the electron, Ernest Rutherford proposed the nuclear model, and Niels Bohr introduced quantised orbits. The modern quantum mechanical model was developed in the 1920s by scientists including Schrodinger and Heisenberg.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<h3>Q2. What is the atomic structure of hydrogen?<\/h3>\n\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<p>Hydrogen has 1 proton, 0 neutrons (in its most common isotope, protium), and 1 electron. Its electronic configuration is 1s1. It is the only element for which Bohr's model provides accurate energy level calculations.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<h3>Q3. What is the atomic packing factor of BCC structure?<\/h3>\n\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<p>The atomic packing factor of a Body-Centred Cubic (BCC) structure is 0.68, meaning 68% of the unit cell volume is occupied by atoms. Common BCC elements include iron and sodium.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<h3>Q4. How many questions come from the Structure of Atom chapter in NEET?<\/h3>\n\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<p>Typically 2 to 3 questions appear from this chapter in NEET, contributing around 4% of the Chemistry section. High-yield topics include Bohr's model, quantum numbers, hydrogen spectral series, and electronic configuration rules.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<h3>Q5. What is the electronic configuration of sodium?<\/h3>\n\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<p>The atomic structure of sodium (Na), with atomic number 11, has the electronic configuration 1s2 2s2 2p6 3s1. Its single valence electron makes it highly reactive and a classic example for questions on stability and ionisation.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\n","protected":false},"excerpt":{"rendered":"<p>The structure of atom is one of the most foundational chapters in NEET Chemistry. It contributes approximately 2 to 3 questions per paper, accounting for around 4% of the Chemistry section.\u00a0 The team at Aakash has carefully reviewed the NEET 2026 syllabus and past question trends to put together this complete guide on structure of [&hellip;]<\/p>\n","protected":false},"author":64,"featured_media":300429,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3716],"tags":[28382,28380,28381,28378,28379],"class_list":["post-300423","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-neet","tag-atomic-structure-class-11","tag-atomic-structure-notes-neet","tag-structure-of-atom-chemistry","tag-structure-of-atom-for-neet","tag-structure-of-atom-neet-2026"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Structure of Atom for NEET 2026: Complete Notes, Atomic 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