When a Nucleus Undergoes Radioactive Decay, the New Atomic Number

Multiple Choice

When a nucleus undergoes radioactive decay, the new atomic number ________
I. can be greater than the original atomic number.
II. can be the same as the original atomic number.
III. can be less than the original atomic number.
IV. must be the same as the original atomic number.

A) I only
B) II only
C) III only
D) IV only
E) I, II, and III only