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4. Structure of The Atom-Chapter Review Science Class 9 In English
Last Updated : 06 March 2026
Explore science Solutions for Class 9 Chapter 4. Structure of The Atom Topic Chapter Review in English medium.
4. Structure of The Atom-Chapter Review Science Class 9 In English
Last Updated : 06 March 2026
4. Structure of The Atom-Chapter Review Science Class 9 In English
4. Structure of The Atom
Chapter Review
Chapter Review:
- Atoms and molecules are the fundamental building blocks of matter.
- The existence of different kinds of matter is due to different atoms constituting them.
- The electron is identified by J.J. Thomson.
- Electrons, protons and nutrons are sub atomic particles.
- E. Goldstein in 1886 discovered the presence of new radiations in a gas discharge and called them canal rays.
- Electrons carry Negative (-) charge.
- Protons carry Positive (+) charge.
- Nutrons carry No any charge.
- J.J. Thomson was the first one to propose a model for the structure of an atom.
- The electrons revolve around the nucleus in well-defined orbits.
- The size of the nucleus is very small as compared to the size of the atom.
- Protons and Nutrons are situated in nucleus of atom.
- Orbits or shells of an atom are represented by the letters K, L, M, and N.
- J. Chadwick discovered another sub atomic particles named nutron.
- The number of protons present in nucleus of an atom is known as atomic number. i.e Atomic mass = total number of protons in nucleus os an atom.
- The sum of the masses of protons and neutrons present in the nucleus is known as Atomic Mass.
- The maximum number of electrons present in a shell is given by the formulla 2n2.
- The electrons present in the outermost shell of an atom are known as the valence electrons.
- The number of valence electrons present in outer most shell of an atom is known as its valency.
- The mass number is defined as the sum of the total number of protons and
neutrons present in the nucleus of an atom. - The atoms of the same element, having the same atomic number but differentmass numbers is called its isotopes.
- Protium, Deuterium and tritium are isotopes of Hydrogen.
- Many elements consist of a mixture of isotopes. Each isotope of an element is a pure substance.
- The chemical properties of isotopes are similar but their physical properties are different.
- An isotope of uranium is used as a fuel in nuclear reactors.
- An isotope of cobalt is used in the treatment of cancer.
- An isotope of iodine is used in the treatment of goitre.
- Atoms of different elements with different atomic numbers, which have the same mass number, are known as isobars.
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NCERT Solutions for Class 9 science Chapter 4. Structure of The Atom Topic Chapter Review
NCERT Solutions for Class 9 science Chapter 4. Structure of The Atom Topic Chapter Review are prepared to help students understand important concepts of the chapter in a simple and clear manner. These solutions are based on the latest CBSE syllabus and follow the official NCERT textbooks. Students who are searching for accurate answers and step-by-step explanations can use these solutions to improve their learning and prepare better for school exams as well as board examinations.
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NCERT books are considered the most reliable study material for CBSE students. Most examination questions are directly based on NCERT textbooks. Therefore studying NCERT Solutions for Class 9 science helps students understand the exact pattern of questions and the correct method of answering them.
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About Chapter 4. Structure of The Atom of Class 9 science
Chapter 4. Structure of The Atom is an important part of the Class 9 science syllabus. This chapter explains several key concepts which are essential for understanding the subject in detail. Students often face difficulties while solving textbook questions related to this chapter. That is why NCERT Solutions for Chapter 4. Structure of The Atom are provided to explain every concept in a simple and structured way.
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Understanding Topic: Chapter Review
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Study NCERT Solutions in english
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By practicing questions from Class 9 science Chapter 4. Structure of The Atom Topic Chapter Review, students can strengthen their conceptual understanding and improve their problem-solving skills.
Conclusion
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4. Structure of The Atom-Chapter Review Science Class 9 In English
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- NCERT Solutions for Classes 6 to 8 – Ideal for building strong basic concepts.
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4. Structure of The Atom-Chapter Review Science Class 9 In English Study Materials For Class 6 to 12
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