(A) The atomic number of carbon $(C)$ is $6$.The ground state electronic configuration of carbon is $1s^2 2s^2 2p^2$.According to Hund's rule of maxim

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(A) The atomic number of carbon $(C)$ is $6$.The ground state electronic configuration of carbon is $1s^2 2s^2 2p^2$.According to Hund's rule of maximum multiplicity,the two electrons in the $2p$ subshell occupy separate orbitals with parallel spins.Therefore,there are $2$ unpaired electrons in the $2p$ subshell.