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(C) The energy of an electron in the $n^{	ext{th}}$ shell is given by the formula:$E_n = -13.6 \frac{Z^2}{n^2} \ 	ext{eV}$As we move away from the n

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increases

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(C) The energy of an electron in the $n^{	ext{th}}$ shell is given by the formula:$E_n = -13.6 \frac{Z^2}{n^2} \ 	ext{eV}$As we move away from the nucleus,the principal quantum number $n$ increases.Since the energy expression has a negative sign,as $n$ increases,the value of $\frac{1}{n^2}$ decreases,making the total energy $E_n$ less negative (i.e.,it becomes more positive).Therefore,the energy of the electron increases as it moves further from the nucleus.

As we move away from the nucleus,the energy of the electron

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