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E = hν

E = hν

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De Broglie (1924) reasoned that e- is both a particle and a wave.

Why is e- energy quantized?

λ = h/(mu)

u = velocity of e-

m = mass of e-

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Energy of orbitals in a one-electron atom

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Energy of orbitals in a multi-electron atom Energy depends on n and l

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