Question

Write two hypothesis of Bohr’s atomic model.

Answer 1

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Answer 2

Answer: Bohr's atomic model is a model of the atom proposed by Danish physicist Niels Bohr in 1913. It was an improvement on previous atomic models that failed to explain why atoms emitted specific colors of light when excited.

Bohr's model proposed that electrons orbit the nucleus of an atom in specific energy levels or shells. These shells are quantized, meaning that electrons can only exist in specific energy levels, and not in between. When an electron absorbs energy, it jumps to a higher energy level or shell. When it returns to its original energy level, it emits a specific color of light that corresponds to the energy difference between the two levels.

Niels Bohr's atomic model proposed several hypotheses to explain the behavior of electrons in atoms. Two of the most important hypotheses of the Bohr atomic model are:

The Hypothesis of Quantized Energy Levels: Bohr proposed that electrons in atoms can only occupy certain energy levels or shells. Electrons can move from one energy level to another by either absorbing or emitting a quantum of energy. This explains the discrete nature of atomic spectra, where only certain wavelengths of light are emitted or absorbed. The energy of the electron is proportional to the distance from the nucleus, and the energy levels get closer together as the distance from the nucleus increases.

The Hypothesis of Fixed Orbital Angular Momentum: Bohr proposed that electrons in atoms have a fixed orbital angular momentum. This means that the electrons can only occupy specific orbits around the nucleus, each with a specific energy level and angular momentum. The angular momentum of an electron is quantized and can only have certain discrete values. This hypothesis helps to explain why electrons do not spiral into the nucleus due to the emission of electromagnetic radiation, as predicted by classical physics.

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