How many neutrons does element X have if its atomic number is 41 and its mass number is 162?

Isn't this Chemistry ... But anyways am a budding Biochemist

(Mass #) = (Atomic #) + (Neutron #)

:. (Neutron #) = (Mass #) - (Atomic #)

= 162 - 41

= 121

Note that: Atomic # = Amount of Protons = Amount of Electrons