How many photons of light are emitted when the electron in a hydrogen atom drops form energy level 3 to 1

In the reading, yao chen-yuan describes traveling to deliver a message. why was he willing to risk danger to travelto tientsin? he wanted to the boxers with their cause

When you perform this reaction, what could remain at the end of the reaction? check all that apply. excess reactant aqueous copper chloride excess reactant aluminum oxygen product solid copper carbon dioxide product aqueous aluminum chloride water

One does not belong why? ice, gold ,wood ,diamond and table salt