ELement A has a valence electronic structure of ns2np1. Element B has the valence electronic structure of ns2np5.

Why would you expect a compound from elements A and B to conduct an electric current in its solid state???

Because it is more than likely an ionic compound.

To understand why a compound formed between elements A and B may conduct electric current in its solid state, we need to examine the valence electronic structures of the two elements.

Element A has a valence electronic structure of ns2np1. This indicates that in its neutral state, it has one electron in the outermost shell of the atom. This electron can be easily lost to form a cation with a +1 charge.

Element B, on the other hand, has a valence electronic structure of ns2np5. This means that in its neutral state, it has five electrons in the outermost shell. It is easier for this element to gain one electron to complete its electron shell and achieve a stable electron configuration. Thus, it has a higher tendency to accept electrons and form an anion with a -1 charge.

When elements A and B react and form a compound, the transfer of electrons from one element to the other is more probable due to the large difference in their electron affinities. This type of bonding is typically observed in ionic compounds, where electrons are transferred from one atom to another.

In an ionic compound, like the one formed between A and B, the positive and negative charges are held together by electrostatic forces, creating a lattice structure. The ions in the solid state are not free to move, resulting in a non-conductive material.

However, when we dissolve the ionic compound in a solvent, such as water, the lattice structure breaks down and the ions dissociate. These free ions now have the ability to move and conduct electric current, as they can carry the electric charge through the solution.

In summary, the compound formed from elements A and B is likely to be an ionic compound, which does not conduct electricity in its solid state. However, when dissolved in a solvent, ionic compounds can form a solution that conducts electric current due to the movement of free ions.