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(A) The atomic number of nitrogen is $Z = 7$. The electronic configuration is $1s^2, 2s^2, 2p^3$.According to Hund's rule of maximum multiplicity,for

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$1s^2, 2s^2, 2p_x^1, 2p_y^1, 2p_z^1$$\uparrow\downarrow$ $\uparrow\downarrow$ $\uparrow$ $\uparrow$ $\uparrow$

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(A) The atomic number of nitrogen is $Z = 7$. The electronic configuration is $1s^2, 2s^2, 2p^3$.According to Hund's rule of maximum multiplicity,for a given electron configuration,the term with the maximum multiplicity has the lowest energy.Therefore,the three electrons in the $2p$ orbitals must occupy separate orbitals with parallel spins.This corresponds to the configuration $1s^2, 2s^2, 2p_x^1, 2p_y^1, 2p_z^1$,which is represented by option $A$.

The ground state electronic configuration of a nitrogen atom $(Z = 7)$ can be represented by which of the following orbital diagrams?

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