Atom and nucleus of atom

Electron orbit
m v^2 / r = e^2 / (4 π ε0 r^2)
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The second postulate of Bohr
h ν = E_k - E_n
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Quantization of electron orbits
m v r = n h / (2 π)
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Bohr orbit radius
r = 4 π ε0 * n^2 * ℏ / (m e^2)
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Bohr radius of the electron orbit
r = n^2 * 0,528 * 10^(-10)
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Velocity of an electron in a Bohr orbit
v  = saknis(e^2 / (4 π ε0 m r))
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Velocity of an electron in a Bohr orbit
v  = e^2 / (4 π ε0 n ℏ)
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