And this one too
what is atomic mass
a the sum of all electrons in the atomic nucleus
b only the neutrons in the atomic nuclear
c the sum of all protons and neutrons in the atomic nucleus
d only the protons in the atomic nucleus

What is atomic mass
C) The sum of all protons and neutrons in the atomic nucleus

You'll find the atomic mass at the bottom of an element box in the periodic table

When does radioactive decay occur
A) When neutrons accumulate in the nucleus

If too many neutrons accumulate, the atom will be become unstable and start decaying.

Ibelieve the answer is b. dugout