The reaction H2O(l) + CO2(aq) H2CO3(aq) is at equilibrium. What does this mean?

It means that the chemical equation is balanced

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.