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CBSE Revision Notes Class 9 Science Chapter 4 Structure of the Atom

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CBSE Revision Notes Class 9 Science Chapter 4 Structure of the Atom

 

CBSE Revision Notes Class 9 Science Chapter 4 Structure of the Atom are provided to help the students understand and revise the concepts right from the beginning. The concepts taught in Class 9 are important to be understood as these concepts are continued in upcoming classes. To score good marks in Class 9 Science examination, it is advised to solve questions provided in the Revision Notes Class 9 Science Chapter 4. These revision notes for Class 9 Science help the students to revise all the concepts in a better way.

Swiflearn provides Revision Notes and keynotes chapter wise for the CBSE board exam in an easy-to-understand, free downloadable PDF format so students can use it for their studies and score better in their board exams. The CBSE Class 9 Revision Notes are made for the main subjects of Science and Science. These core subjects are very critical as they are the stepping stones and plays a crucial role in student’s future. They might be tricky for students. The CBSE Class 9 Revision Notes for each chapter will enable them to have an expert studying pattern with which they can enjoy learning the subject and perform better in the exams.

CBSE Class 9 Science Revision Notes are designed  keeping in my mind the exam pattern and syllabus of NCERT 2020-21. Students can download the PDF for free and practice the questions to score well in the coming exams.

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CBSE Revision Notes Class 9 Science Chapter 4 Structure of the Atom

 

Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged), and the neutrons (no charge). The outermost regions of the atoms are called electron shells and contains electrons (negatively charged).

Electron:- The electron is a subatomic particle, symbol e, whose electric charge is negative one elementary charge. They are known as elementary particles because they have no known components or substructures. The electrons have a mass that is approximately 1/1836 that of a proton.

Proton:- A proton is a subatomic particle, symbol p, with a positive electric charge of +1e elementary and a mass slightly less than of a neutron. Protons and neutrons, each with masses of approximately one atomic mass unit, are collectively referred to as nucleons (particles present in the nucleus).

 

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