What is a chemical bond? a. a representation of chemical properties b. a substance that's composed of atoms c. the force that holds together the elements in a compound d. the attraction of two atoms that holds the atoms togethe?

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?