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in Dual Nature of Radiation and Matter by (26.7k points)
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Bohr combined classical and early quantum concept and gave his theory in the form of three postulates.

1. State three postulates of Bohr Model of atom?

2. The total energy of an electron in ground state of hydrogen atom is -13.6 eV. What is the significance of negative sign?

3. The radius of innermost electron orbit of hydrogen atom is 5.3 × 1011 m. What are the radii of n = 2 and n = 3 orbits?

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1. Bohr postulates:

Bohr combined classical and early quantum concepts and gave his theory in the form of three postulates. 

Electrons revolve round the positively charged nucleus in circular orbits.

The electron which remains in a privileged path cannot radiate its energy.

The orbital angular momentum of the electron is an integral multiple of h/2π. 

Emission or Absorption of energy takes place when an electron jumps from one orbit to an other.

2. Negative sign implies that the electrons are strongly bounded to the nucleus.

3. 

  • rn = n2a0 = 5.3 × 10-11m
  • r1 = a0 = 5.3 × 10-11m
  • r2 = 4a0 = 21.2 × 10-11m
  • r3 = 9a0 = 47.7 × 10-11m.

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