Predict whether the nuclear isotopes below will be stable. If they are not stable, be sure to choose the correct decay mode.
A. Unstable, negatron decay
B. Unstable, positron or electron capture
C. Unstable, alpha decay
D. Stable
Radium-226
Boron-8
Phosphorous-32
Carbon-13
Nitrogen-14
Carbon-12
Thorium-230