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Why is the negative sign for energy of t...

Why is the negative sign for energy of the electron in hydrogen atom for all possible orbits?

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Energy of the electron in the atom is lower than that of a free electron at rest (at infinite distance from the nucleus and having energy equal to zero), `E_(a) = 0`. As the electron gets closer to the nucleus, the absolute value of energy `(E_(n))` becomes larger and more and more negative. The most negative value corresponds to n=1, which is the most stable orbit.
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