Describe the number of neutrons in atom of cl-37

Protons equals atomic number which is 17
the atomic mass for chlorine is 37 (because it says cl-37) 
in-order to find the number of neutrons
neutrons= atomic mass- number of protons
37-17=20

therefore 20 neutrons

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.