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  4. Energy of an atom is least when electron revolves in an orbit which is

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Q. Energy of an atom is least when electron revolves in an orbit which is

Atoms

Solution:

The energy of an atom is the least (largest negative value) when its electron is revolving in an orbit closest to the nucleus i.e., the one for which $n=1$. For $n=2,3 \cdots$ the absolute value of the energy $E$ is smaller.