A: The energy of an electron can be determine | vedclass

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(A) The energy of an electron in a hydrogen-like atom is given by the formula $E_n = -\frac{13.6 \ Z^2}{n^2} \ eV$,which depends on the principal quan

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$A$ and $R$ are both correct and $R$ is the correct explanation of $A$.

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(A) The energy of an electron in a hydrogen-like atom is given by the formula $E_n = -\frac{13.6 \ Z^2}{n^2} \ eV$,which depends on the principal quantum number $n$.Thus,statement $A$ is correct.The principal quantum number $n$ defines the shell and determines the average distance of the electron from the nucleus.Thus,statement $R$ is correct and it explains why the energy depends on $n$ (as energy is a function of distance from the nucleus).Therefore,the correct option is $A$.

$A$: The energy of an electron can be determined by the principal quantum number.
$R$: The principal quantum number $(n)$ determines the possible distance of the electron from the nucleus.

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$A$: The energy of an electron can be determined by the principal quantum number.$R$: The principal quantum number $(n)$ determines the possible distance of the electron from the nucleus.