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NCERT Textbook: Journey Inside the Atom
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| 1. What are the basic components of an atom? |  |
Ans. An atom is primarily composed of three types of subatomic particles: protons, neutrons, and electrons. Protons are positively charged particles found in the nucleus, neutrons are neutral particles also located in the nucleus, and electrons are negatively charged particles that orbit the nucleus in electron shells.
| 2. How do protons and neutrons contribute to an atom's mass? | |
Ans. Protons and neutrons, collectively known as nucleons, contribute significantly to the mass of an atom. Each proton has a mass of approximately 1 atomic mass unit (amu), and each neutron also has a mass close to 1 amu. In contrast, electrons have a negligible mass compared to protons and neutrons, thus the mass of an atom is primarily determined by the number of protons and neutrons in its nucleus.
| 3. What is the significance of electron configuration in atoms? | |
Ans. Electron configuration describes the distribution of electrons in an atom's electron shells and subshells. This configuration is crucial as it determines the chemical properties of an element, including its reactivity, ionisation energy, and the types of bonds it can form with other atoms. Understanding electron configuration helps in predicting how an element will behave in chemical reactions.
| 4. Who were the key scientists in the development of atomic theory? | |
Ans. Key scientists in the development of atomic theory include John Dalton, who proposed the first modern atomic theory in the early 19th century, J.J. Thomson, who discovered the electron and introduced the plum pudding model, Ernest Rutherford, who conducted the gold foil experiment and revealed the nucleus's existence, and Niels Bohr, who developed the Bohr model of the atom, incorporating the concept of quantised energy levels for electrons.
| 5. What is the role of valence electrons in chemical bonding? | |
Ans. Valence electrons are the electrons located in the outermost shell of an atom. They play a crucial role in chemical bonding as they are involved in the formation of bonds with other atoms. Atoms tend to gain, lose, or share valence electrons to achieve a stable electron configuration, typically resembling that of the nearest noble gas. This process leads to the formation of ionic or covalent bonds, essential for the creation of compounds.
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Apr 25, 2026 Last updated
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Document Description: NCERT Textbook: Journey Inside the Atom for Class 9 2026 is part of Science Class 9 New NCERT 2026-27 (New Syllabus) preparation. The notes and questions for NCERT Textbook: Journey Inside the Atom have been prepared according to the Class 9 exam syllabus. Information about NCERT Textbook: Journey Inside the Atom covers topics like and NCERT Textbook: Journey Inside the Atom Example, for Class 9 2026 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for NCERT Textbook: Journey Inside the Atom.
Introduction of NCERT Textbook: Journey Inside the Atom in English is available as part of our Science Class 9 New NCERT 2026-27 (New Syllabus) for Class 9 & NCERT Textbook: Journey Inside the Atom in Hindi for Science Class 9 New NCERT 2026-27 (New Syllabus) course. Download more important topics related with notes, lectures and mock test series for Class 9 Exam by signing up for free. Class 9: NCERT Textbook: Journey Inside the Atom
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NCERT Textbook: Journey Inside the Atom of Science Class 9 New NCERT 2026 is the updated edition as per the latest syllabus of the 2026-27, PDF available for download.
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