Which statement is true in regard to diatomic molecules.

a. they are held together through electrostatic forces.

b. they are held together by covalent bonds. < -- i believe this is the answer.

c. they are formed with a metal and a nonmetal bond.

d. they are examples of polyatomic ions.

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?