Answer:
Alpha
214 and 82
Beta
85
Explanation:
Radioactive emissions involves the spontaneous disintegration followed by the emission of radiation which is in the form of radioactive particles.
When an element emits an alpha particle, it is expected that the number of protons and the mass number decreases by a factor of 2 and 4 respectively. This is because the alpha radiation is an helium atom. Hence since we had 218 and 84 before, we simply subtract 4 from the mass number and 2 from the atomic number.
For a better particle emission, the mass number stays the same. It is only the atomic number that is affected. Beta decay could be a positive one or a negative one. For a positive beta decay, there is a decrease in the atomic number but for a negative beta decay which is of course is more popular, there would be an increase in the number of protons.
