Journey Inside the Atom — Class 9 Science NCERT Solutions (Free)

Free step-by-step NCERT solutions for Class 9 Science chapter "Journey Inside the Atom" — 8 important questions with detailed answers for CBSE board exam preparation.

TL;DR: Free step-by-step NCERT solutions for Class 9 Science chapter "Journey Inside the Atom" — 8 important questions with detailed answers for CBSE board e…

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Key Questions Covered:

  1. What are the three subatomic particles and their charges?
  2. State and explain Thomson's model of atom.
  3. What are the main features of Rutherford's model of atom?
  4. + 5 more questions in the full chapter

Solutions Summary:

Question Status
What are the three subatomic particles and their charges? ✓ Solved
State and explain Thomson's model of atom. ✓ Solved
What are the main features of Rutherford's model of atom? ✓ Solved

Showing 3 of 8 questions

Q1: What are the three subatomic particles and their charges?

The three subatomic particles are: (1) Electron — negatively charged (charge = -1), mass = 1/1836 amu, found in orbitals around nucleus (2) Proton — positively charged (charge = +1), mass = 1 amu, present in nucleus (3) Neutron — neutral (charge = 0), mass ≈ 1 amu, present in nucleus

Q2: State and explain Thomson's model of atom.

Thomson's model (plum pudding model): Atom is a sphere of positive charge with electrons embedded in it like raisins in a pudding. Characteristics: (1) Positive charge uniformly distributed throughout atom (2) Electrons scattered throughout in this positive charge (3) Atom is electrically neutral Li...

Q3: What are the main features of Rutherford's model of atom?

Rutherford's nuclear model: (1) Atom has a small, dense, positively charged nucleus at center (2) Electrons revolve around nucleus in circular paths (3) Most of atom's mass is concentrated in nucleus (4) Nucleus contains protons; electrons in orbits (5) Atom is mostly empty space Limitation: Could n...

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