Atoms release energy when_
a. electrons move to a lower energy level
b. electrons move to a higher energy level
c. protons move to a higher energy level
d. protons move to a lower energy level

Water's surface tension and heat storage capacity are accounted for by its a) orbitals b) weight c) hydrogen bonds d) mass e) size

The biosphere of the earth is made up of what compound? organic or inorganic?

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?