What is the significance of negative sign on electronic energy ?

1.	What is the significance of negative sign on electronic energy ?
Answer» atoms, negative value of potential energy for electronics means they are stable and bound to the atom and external energy is required to ionize the atom. Consider case of hydrogen. In ground state, the electron has energy equal to -13.6eV. This means 13.6eV of energy is required to break the atom.

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