What subatomic particle(s) is on the outside of the atom?

electrons

Explanation:

protons and neutrons are found in the nucleus while electrons are outside the nucleus

A. 25Mn45^+

B. 45Rh69^+2

C. 53I142^-

D. 97Bk^243

Explanation:

Generally Atomic mass (A)= no of protons (p) + no of neutrons (n)

No of Neutrons (n)=A-p

No of protons = Atomic number

Symbol for nulclide: zX^A

Z is Atomic number, A is Atomic mass

And X is symbol of element