Which of the following gases is most closely linked to day-to-day weather changes?

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.

Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules