Two atoms with different numbers of protons are what?

What metric units would you use to measure the thickness of a key

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?

What is happening when the water inside a kettle heats up and begins to boil