When Po Emits a Beta Particle, It Transforms into a New

Multiple Choice

When Po emits a beta particle, it transforms into a new element. What are the atomic number and atomic mass of this new element?

A) atomic number = 84; atomic mass = 219
B) atomic number = 86; atomic mass = 214
C) atomic number = 85; atomic mass = 218
D) atomic number = 82; atomic mass = 214