Why do some salts dissolve spontaneously even though the process is endothermic overall?

The process of ionic compounds like salts dissolving into an aqueous or other kind of polar solvent is independent of the fact of whether or not the process is endo or exothermic. The amount of heat energy needed is very very small.

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.