We’re being asked to determine which particle has the most penetrating power rank 

The different types of particles are:

alpha particle:  ⁴₂α (atomic mass = 4, atomic number = 2, positively charged)

beta particle:  ⁰_–1β (atomic mass = 0, atomic number = –1, negatively charged)

gamma particle:  ⁰₀γ (atomic mass = 0, atomic number = 0, no charge)

positron particle:  ⁰₁e (atomic mass = 0, atomic number = 1, positively charged)

neutron: ¹₀n (atomic mass = 1, atomic number = 0, neutral)