HELP! Does hydrogen oxygen have large or small difference of ionization energy? What about for electron affinity?

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Tell me the iupac name of the following compounds:

What is the value of the standard enthalpy of formation of an element in its most stable form?