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Bohrs Atomic Model

Bohrs Atomic Model Scientist Neils Bohr gave some corrections to Rutherford's atomic model in 1913. This corrected model is called the Bohr's atomic model. The main postulates of this model are - a) The electron moves around the nucleus in a circular motion, about an axis. This circular motion is called an energy level or orbit. They are also known as the shell or permanent orbit or principal energy level. Electrons do not absorb or emit any energy when they revolve these fixed orbits. If we express the permanent orbit as n, then n = 1, 2, 3, 4, etc.  In other words, if n = 1, the principal energy level is K,  when n = 2, L is the principal energy level,  when n = 3, M is the principal energy level,  when n = 4, N is the principal energy level, etc. b) According to Bohr's model, the angular momentum of an electron in an energy level is mvr =  nh / 2𝜋 . Here, m = the mass of the electron (9.11×10 -31  kg) r = the radius of the orbit that the electron follows v = the veloc

States of Matter

 Chemistry

Chapter - 2: States of Matter

👉 All Chapter Contents 👈 


  • 2.1 Three States of Matter

  • 2.2 Kinetic Theory of Particles

  • 2.3 Diffusion

  • 2.4 Effusion

  • 2.5 Burning of a Candle and the Three States of Wax

  • 2.6 Melting and Boiling

  • 2.7 Distillation and Sublimation


Question Bank

2.1  Three States of Matter

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2.2  Kinetic Theory of Particles

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2.3 Diffusion

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2.4 Effusion

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2.5 Burning of a Candle and the Three States of Wax

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2.6 Melting and Boiling

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2.7 Distillation and Sublimation

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Secondary Chemistry


  • Chapter - 1 : Concept of Chemistry
  • Chapter - 2 : States of Matter
  • Chapter - 3 : Structure of Matter
  • Chapter - 4 : Periodic Table
  • Chapter - 5 : Chemical Bond
  • Chapter - 6 : Concept of Mole and Chemical Counting
  • Chapter - 7 : Chemical Reactions
  • Chapter - 8 : Chemistry and Energy
  • Chapter - 9 : Acid-Base Balance
  • Chapter - 10 : Mineral Resources: Metal - Nonmetal
  • Chapter - 11 : Mineral Resources: Fossils
  • Chapter - 12 : Chemistry in Our Lives

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