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Find the following information for the elements shown in Fig. 8.17: (i) Name of the element (ii) Symbol (iii) Total number of electrons (iv) Number of valence electrons (v) Valency of the element (vi) Number of protons (vii) Atomic number
For element a: Lithium, symbol Li, total electrons 3, valence electrons 1, valency 1, protons 3, atomic number 3. For element b: Carbon, symbol C, total electrons 6, valence electrons 4, valency 4, protons 6, atomic number 6. For element c: Phosphorus, symbol P, total electrons 15, valence electronsRead more
For element a: Lithium, symbol Li, total electrons 3, valence electrons 1, valency 1, protons 3, atomic number 3. For element b: Carbon, symbol C, total electrons 6, valence electrons 4, valency 4, protons 6, atomic number 6. For element c: Phosphorus, symbol P, total electrons 15, valence electrons 5, valency 3, protons 15, atomic number 15. For element d: Fluorine, symbol F, total electrons 9, valence electrons 7, valency 1, protons 9, atomic number 9.
For more NCERT Solutions of Class 9 Science Exploration Chapter 8 Journey Inside the Atom Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-8/
See lessMagnesium is essential for many biological processes, including muscle contraction. For an atom of magnesium with a mass number of 24 and atomic number 12, determine the number of (i) protons, (ii) neutrons, (iii) electrons and also illustrate the arrangement of electrons in a magnesium atom.
For magnesium, the atomic number of 12 establishes 12 protons and 12 electrons in a neutral atom. Subtracting the atomic number from the mass number 24 yields 12 neutrons. Applying the Bohr-Bury rules, the arrangement of its twelve electrons across energy shells is K-shell contains 2 electrons, L-shRead more
For magnesium, the atomic number of 12 establishes 12 protons and 12 electrons in a neutral atom. Subtracting the atomic number from the mass number 24 yields 12 neutrons. Applying the Bohr-Bury rules, the arrangement of its twelve electrons across energy shells is K-shell contains 2 electrons, L-shell contains 8 electrons and M-shell contains 2 electrons, written as 2, 8, 2.
For more NCERT Solutions of Class 9 Science Exploration Chapter 8 Journey Inside the Atom Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-8/
See lessAssertion (A): The discovery of subatomic particles helped in understanding the atomic structure. Reason (R): The number of electrons is equal to the number of protons in an atom. Choose the correct option: (i) Both A and R are true and R is the correct explanation of A. (ii) Both A and R are true, but R is not the correct explanation of A. (iii) A is true, but R is false. (iv) A is false, but R is true.
Option (ii) is the correct choice. Assertion A is true because discovering electrons, protons and neutrons explained internal organization, chemical behavior and bonding. Reason R is also true because an atom contains equal counts of protons and electrons, ensuring neutrality. However, statement R sRead more
Option (ii) is the correct choice. Assertion A is true because discovering electrons, protons and neutrons explained internal organization, chemical behavior and bonding. Reason R is also true because an atom contains equal counts of protons and electrons, ensuring neutrality. However, statement R simply describes atomic electrical balance and does not serve as the complete scientific explanation for how subatomic discoveries unveiled overall atomic structure.
For more NCERT Solutions of Class 9 Science Exploration Chapter 8 Journey Inside the Atom Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-8/
See lessExplain and arrange the following statements in the correct chronological order to show how atomic models have evolved over time. (i) Bohr’s model proposed that electrons move in fixed orbits around the nucleus, each with a definite energy. (ii) Thomson’s model depicted the atom as a ‘plum pudding’ with electrons embedded in a sphere of positive charge. (iii) Rutherford’s model proposed that atoms have a dense central nucleus. (iv) Dalton’s model described atoms as indivisible particles.
The correct chronological sequence is (iv), (ii), (iii), then (i). In 1808, Dalton modeled atoms as indivisible building blocks. In 1897, Thomson proposed the plum pudding model featuring embedded electrons. In 1911, Rutherford established that atoms contain a dense positive central nucleus. FinallyRead more
The correct chronological sequence is (iv), (ii), (iii), then (i). In 1808, Dalton modeled atoms as indivisible building blocks. In 1897, Thomson proposed the plum pudding model featuring embedded electrons. In 1911, Rutherford established that atoms contain a dense positive central nucleus. Finally, in 1913, Bohr proposed that electrons revolve within stable, fixed energy shells without radiating energy.
For more NCERT Solutions of Class 9 Science Exploration Chapter 8 Journey Inside the Atom Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-8/
See lessElectrons move around the nucleus in orbits. Why do they not fly away from the atom? Explain what keeps them attracted to the nucleus.
Electrons remain bound within the atom because of the electrostatic force of attraction operating between opposite electric charges. The atomic nucleus contains positively charged protons, whereas the revolving electrons carry negative charges. This mutual electrical attraction pulls the electrons iRead more
Electrons remain bound within the atom because of the electrostatic force of attraction operating between opposite electric charges. The atomic nucleus contains positively charged protons, whereas the revolving electrons carry negative charges. This mutual electrical attraction pulls the electrons inward toward the nucleus, providing the required centripetal attraction that keeps them in their orbits and prevents them from flying away into space.
For more NCERT Solutions of Class 9 Science Exploration Chapter 8 Journey Inside the Atom Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-8/
See less