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In quantum mechanics, when applied to an isolated atom, an allowed orbit can refer to the spacial path of an electron which satisfies the Schroedinger Equation. This allowed path can be interpreted as the balance between kinetic energy (electron motion) and potential energy (proximity to nucleus) which returns a single energy. In band theory of solids, allowed states are defined by the bragg diffraction condition, which is constructive or destructive interference based on wavelength. Since electrons can be regarded as a particle or wave, an electron with a certain momentum has a wavelength (classically defined as: p = mass x velocity, but de broglie relation: p = constant / wavelength). Since there is a set distance between atoms in a material, this spacing determines which wavelengths destructively interfere, or cannot propagate, throughout the material. This means that electrons at a certain kinetic energy (related to motion) cannot exist, given the position of atoms. It should be noted that the "allowed states" in multi-atomic systems are a continuous range (or "BAND") of kinetic energies that an electron can adopt in a material. As there are FEWER atoms that comprise the material, the BAND thickness of allowed states grows NARROWER. In the case of a SINGLE atom, the continuous range collapses to a single line, corresponding to ONE energy of an allowed orbital. References: http://en.wikipedia.org/wiki/Band_theory

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What number was the inner orbit designated?

The innermost orbit is designated as orbit 1.


How many electrons per orbit can be found in an atom?

The number of electrons per orbit in an atom is determined by the energy level of the orbit. Each orbit can hold a maximum number of electrons, with the first orbit holding up to 2 electrons, the second holding up to 8 electrons, the third holding up to 18 electrons, and so on.


How many electrons does sodium have in it's outer orbit?

Sodium has 1 electon in it's outer orbit, 8 in the second and 2 in the first.


How many electrons are in the largest bohr orbit of the uranium atom?

The largest Bohr orbit of the uranium atom can hold up to 92 electrons, as uranium has 92 protons. Each orbit in an atom can hold a maximum number of electrons given by the formula 2n^2, where n is the principal quantum number of the orbit.


What is space quantization?

This is a term from the field of Quantum Mechanics which describes how the plane of an orbiting electron, in an atom, can only have a certain number of orientations. For example; if you take a vertical line as the center of the orbit, then the plane of the orbit might be perpendicular to the vertical line. Or it might be tilted 30 degrees from the vertical. Or it might be tilted 60 degrees from the vertical. Whatever the allowed angles might be, the idea is no other angles are allowed. So rather then a "continous" range of allowed angles, there are instead only a few "quantized" allowed values. Since this quantization refers to orientations in space it is called "space quantization".

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