how is the Bohr atomic model different from the plum-pudding model ?

The plum-pudding model suggested a uniform distribution of electrons within a positively charged atom, whereas the Bohr atomic model introduced the concept of quantized energy levels and specific orbits for electrons.

The Bohr atomic model and the plum-pudding model are two distinct models that were proposed to explain the structure of atoms, and they differ in their fundamental concepts.

The plum-pudding model, also known as the Thomson model, was proposed by J.J. Thomson in 1904. According to this model, an atom consists of a positively charged sphere (the "pudding") with embedded negatively charged electrons (the "plums").

In other words, the electrons were thought to be uniformly distributed throughout the positively charged atom. This model suggested that the atom was overall neutral and did not contain any distinct substructures.

On the other hand, the Bohr atomic model, proposed by Niels Bohr in 1913, introduced the concept of quantized energy levels within an atom. According to this model, electrons orbit the nucleus in specific, discrete energy levels or shells.

These energy levels are represented by fixed orbits or paths, with electrons occupying only certain allowed orbits. The model also introduced the idea that electrons can transition between energy levels by emitting or absorbing energy in discrete packets called photons. This model explained phenomena like atomic spectra and the stability of atoms.

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