What is the difference between an “orbit” as described in the Bohr-Rutherford model of the atom and an“orbital” as described in the quantum mechanism model of the atom?

The Bohr-Rutherford model and the quantum mechanical model describe the atom in different ways, particularly when it comes to the concept of an "orbit" versus an "orbital".

1. Orbit in Bohr-Rutherford Model: In the Bohr-Rutherford model, an electron's path around the nucleus is defined as an "orbit", similar to how planets orbit around the sun. The electrons move in a circular path at a fixed distance from the nucleus. These orbits are also known as energy levels, and each orbit can hold a specific number of electrons.

2. Orbital in Quantum Mechanical Model: The quantum mechanical model, on the other hand, describes an "orbital" as a region around the nucleus where there is a high probability of finding an electron. Unlike the Bohr model, the quantum mechanical model does not define a specific path for the electron. Instead, it provides a statistical probability of where the electron might be found. An orbital can come in various shapes (spherical, dumbbell-shaped, etc.) and orientations depending on the energy level and sublevel of the electron.

In summary, the main difference between an "orbit" and an "orbital" lies in the certainty of the electron's location. The Bohr-Rutherford model depicts electrons in definite orbits, while the quantum mechanical model describes areas (orbitals) where electrons are likely to be found.