Question

the overall charge is -1 for the lewis structure shown below. choose the possible identity or identities of the central atom.

Explanation:

• For option A: F is a halogen. Halogens usually form one - bond. In the given Lewis structure, the central atom forms three bonds (assuming the oxygen - like atoms are monovalent for bonding consideration here, as in some oxyanion - like structures). So F is not a candidate.
• For option B: N, P, As are in group 15. They have 5 valence electrons. If the central atom has 3 bonding pairs (assuming the oxygen - like atoms are monovalent for bonding consideration here, as in some oxyanion - like structures) and 1 lone pair (total of 4 electron groups), and with an overall charge of - 1. Using the formula for formal charge \(FC = V-(L + \frac{B}{2})\), where \(V\) is the number of valence electrons, \(L\) is the number of non - bonding electrons, and \(B\) is the number of bonding electrons. For example, for N: \(V = 5\), if \(B=6\) (3 bonds) and \(L = 2\) (1 lone pair), \(FC=5-(2 + 3)=0\). But considering the overall charge of the ion, these elements can form such structures (e.g., \(NO_3^-\), \(PO_3^{3 -}\) (but with charge adjustments, similar bonding patterns)).
• For option C: C, Si, Ge are in group 14. They have 4 valence electrons. To form 3 bonds (assuming the oxygen - like atoms are monovalent for bonding consideration here) and have a charge of - 1, the electron accounting does not match well as their typical bonding to achieve octet (with the given bond count) would not lead to the - 1 charge in a simple way (compared to group 15 elements).
• For option D: B and Al are in group 13. They have 3 valence electrons. To form 3 bonds (assuming the oxygen - like atoms are monovalent for bonding consideration here), they would have a formal charge of 0 (if no lone pairs) and do not account for the - 1 charge easily.
• For option E: Cl, Br, I are halogens. They usually form one bond (in simple cases). In the given Lewis structure, the central atom forms three bonds (assuming the oxygen - like atoms are monovalent for bonding consideration here), so they are not suitable.

Answer:

B. N, P, or As