The isotopes of an element have the same number
a atomic
b mass
c nuclear
d neutron ​

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.

Ibelieve your answer is true 

The metal is named first