A student adds 50 mLs of water to 20 mLs of a 5 M stock solution. What is the molarity of
the diluted solution? Remember, the final volume of the diluted solution (V2) includes the
stock solution and water.

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.

Bthats what im doing to and i figured it out it is b

The answer is solid copper 

Is there a c and d?