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What do you understand by ground state a...

What do you understand by ground state and excited state of an atom?

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As long as an electron is revolving in a particular orbit, it neither loses nor gains energy. This stable state of atom with lowest energy is called ground state of an atom. Energy is lost or gained by an electron when it jumps from one orbit to another. If an electron absorbs energy, it will jump to some outer shell. The atom is then said to be in the excited state.
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