What is the number of bonding and antibonding electrons,...

The atomic number of Lithium ($\text{Li}$) is $3$.

Total number of electrons in $\text{Li}_2$ molecule is $6$.

The molecular orbital electronic configuration of $\text{Li}_2$ is \sigma_{1s}^{2} \sigma^{*}_{1s}^{2} \sigma_{2s}^{2}.

Number of bonding electrons ($N_b$) = $2 + 2 = 4$.

Number of antibonding electrons ($N_a$) = $2$.

Therefore, the number of bonding and antibonding electrons are $4$ and $2$, respectively.

Answer: $4$ and $2$