I NEED HELP PLEASE, THANKS!

Explain the bonding that occurs between sodium and chlorine. Specifically, what kind of bonding takes place, what’s the name of the resulting compound, and what properties would you expect this compound to have with respect to water?

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?