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the answer would be A an electron moving around the nucleus of an atom

The movement of the Earth around the Sun is more similar to an electron moving around the nucleus of an atom.

What is the concept of Bohr model?

According to the Bohr model, the electron mediates in circular orbits around the nucleus. The orbits possess quantized energies and sizes. The emission of energy takes place from the atom when the electron moves from one orbit to another closer to the nucleus.

In atomic physics, Bohr model refers to a system comprising of a dense nucleus surrounded by the electrons which orbits around it. It is similar to the composition of the Solar system, however, with attraction offered by the electrostatic forces in place of gravity.

Thus, It can be said that the movement of electrons around the nucleus of an atom resembles to the  movement of Earth around the Sun.

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