How many moles are in 3.50 x 1024 atoms of yttrium

3.50×1024=3584 moles( I just multiply these numbers 3.50×1024 ) and got 3584

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.