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The orbital velocity of the electron is (2.16E6m/s)Z/n, where n is the orbital level. The speed decreases when the the orbital level n increases and increases when the orbital level decreases. Z is the atomic Number.

Example for Z=1.

The electron changes orbitals at a speed of -(2.16E6)/n^2. At the first orbital level the speed is -2.16E6m/s going to the second level; at the second level the speed is .54E6m/s going to the third level.

When the electron goes to a lower level the speed increases.

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