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Get CBSE Notes for Class 9 Science Chapter 4. Structure of The Atom: Non-atomic particles prepared by experts as per the latest NCERT syllabus and CBSE exam pattern. These concise and easy-to-understand notes cover important definitions, formulas, diagrams, and key concepts from the chapter to help students in quick revision and effective exam preparation. Whether you are studying for school tests, board exams, or competitive exams, these notes provide a reliable study resource. Designed in simple language with point-wise explanations, they save time and enhance learning efficiency. Download free PDF notes, explore solved examples, and strengthen your understanding of [Topic Name] for scoring high marks. Perfect for Class 9 students who want clear, structured, and exam-oriented notes for CBSE Science.
Chapter 4: The Structure of Atom
Atom: The smallest tiny particles of matter is called atom.
There are three subatomic particles.
(i) Protron
(ii) Neutron
(iii) Electron
The two particles of these particles are charged.
(i) Protron: It is positively charged particle which is situated inside the nucleus od an atom. It shows all the chemical properties of an atom. Increasing or decreasing the number of protons of an atom caused changing in chemical properties.
The discovery of Proton was made by E. Goldstein.
(ii) Electrons: These are negatively charged (-) particles which revolve around the nucleus in well-defined orbits.
The discovery of Electrons was made by J. J. Tomson.
(iii) Neutron: Nutrons are elecrically no charge non-atomic particles which are present in nuceus of an atom. They have no any charge.
The discovery of nutrons :
In 1932, J. Chadwick discovered another subatomic particle which had no charge and a mass nearly equal to that of a proton. It was eventually named as neutron.
Neutral Atom: Generally, all atoms are electrically neutral, because the number of positively charged particles protons are equal to negatively charged particles electrons in any atom. This is the cause to be an atom neutral and net charges on it is zero.
Example : Oxygen has 8 positively charge particles protons and 8 negatively charged particles electrons.
Canal Rays : Canal rays are stream of positively charged particles emitted from anode of immersion tube, when electric current is flown through gas at very low pressure.
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Ace your exams with CBSE Notes for Class 9 Science chapter 4. Structure of The Atom: Non-atomic particles. These notes provide a clear explanation of important concepts, formulas, diagrams, and solved examples from the NCERT syllabus. Specially designed for Class 9 students, the notes are structured in a simple, point-wise manner to make revision quick and effective. Whether you are preparing for school tests, board exams, or competitive exams, these Science notes will boost your confidence and save valuable study time. You can also download Science class 9 chapter 4. Structure of The Atom free PDF notes for offline learning. With easy-to-grasp language, exam tips, and well-organized content, these CBSE Science notes on chapter 4. Structure of The Atom – Non-atomic particles are the perfect study companion for scoring high marks and mastering the subject.
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