Answer
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The Bohr model of the atom is a theoretical model of atomic structure proposed by Niels Bohr in 1913. It is based on the assumption that electrons move around the nucleus of an atom in fixed, circular orbits, similar to the way planets move around the sun in the solar system.
In the Bohr model, when we say something is quantized, we mean that certain properties of the electron orbits are restricted to certain discrete values, rather than being able to take on any value. For example, the angular momentum of the electrons is quantized, meaning that it can only have certain specific values, and the energy levels of the electrons are also quantized, meaning that they can only exist at certain specific energy levels.
The Bohr model of the hydrogen atom explains the hydrogen emission spectrum by postulating that electrons can only exist in certain specific energy levels, or "shells," around the nucleus. When an electron jumps from a higher energy level to a lower energy level, it releases a photon of energy, which corresponds to a specific frequency of light. The collection of these photons of light forms the hydrogen emission spectrum.
The Bohr model is fundamentally incorrect because it does not take into account the wave-like nature of electrons, which was later described by the quantum mechanical model of the atom. Additionally, the Bohr model could not explain the spectra of atoms with more than one electron. The Bohr model also does not provide a complete explanation for the electron-electron interactions and the spin of electrons.
