What particle or nucleus X is needed to complete the following equation?
40
19 K ? $$0$$
$- 1$ e + X

Question

What particle or nucleus X is needed to complete the following equation? 
40
19 K ? $$0$$
$- 1$ e + X

Quizplus · Accepted Answer

The given equation represents a beta decay process where a potassium-40 nucleus emits a beta particle (an electron) and transforms into a different element. In beta decay, the atomic number increases by 1 (from 19 to 20), but the mass number remains the same (40). Therefore, the product nucleus is calcium-40, as it has the atomic number 20 and mass number 40.

What Particle or Nucleus X Is Needed to Complete the Following