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  1. Glossary
  2. /Chemistry
  3. /Bohr Model of the Atom

What is Bohr Model of the Atom?

In short

The Bohr model pictures a hydrogen atom as an electron moving in a circular orbit of fixed energy around the nucleus, and it explains the lines in the hydrogen spectrum.

In simple words

Niels Bohr said that an electron stays in certain allowed orbits, numbered n=1,2,3,…n = 1, 2, 3, \dotsn=1,2,3,…, without radiating energy. It gives out or takes in light only when it jumps between orbits. The energy of the orbit is En=−13.6 eVn2E_n = -\dfrac{13.6\ \text{eV}}{n^2}En​=−n213.6 eV​ for hydrogen. The model works well for hydrogen and one-electron ions, but it fails for larger atoms and has been replaced by the quantum mechanical model.

Example

An electron falls from n=3n = 3n=3 to n=2n = 2n=2 in hydrogen. The energy released is −1.51 eV−(−3.40 eV)=1.89 eV-1.51\ \text{eV} - (-3.40\ \text{eV}) = 1.89\ \text{eV}−1.51 eV−(−3.40 eV)=1.89 eV, which is red light, the H-alpha line.

Also searched as: model of hydrogen, bohr model of hydrogen atom, hydrogen bohr model, atomic model for hydrogen.

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Related terms

  • Quantum Numbers
  • Pauli Exclusion Principle
  • Isotope

← All glossary terms

Learn it in

  1. Light, Spectra and the Bohr ModelClass 11 to 12
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Practise

  1. A sample of hydrogen atoms, all in the ground state, is lit with light of wavelength…Advanced
  2. A hydrogen-like ion has one electron and a nucleus of charge +Ze…Hard
  3. Find the energy needed to remove the electron from B⁴⁺, with Z = 5, in its ground state…Medium
The ion He⁺ has one electron. Find the wavelength of the photon given out when its…Hard
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Quick questions

  1. The electron of a He⁺ ion falls from n = 2 to n = 1 and gives out a photon. This photon…Advanced
  2. In the Bohr model, compare the electron of a He⁺ ion (Z = 2) in the orbit n = 4 with the…Advanced
  3. The figure shows the four lowest energy levels of the He⁺ ion, at -54.4, -13.6, -6.04…Hard

More Chemistry terms

  1. Acids, Bases and pH
  2. Alkane (Saturated Hydrocarbon)
  3. Allotrope
  4. Atom
  5. Catalyst
  6. Chemical Formulae and Equations
All Chemistry terms →

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