When is alpha particle emission most likely to occur?

When the nucleus has more than 83 protons.

When the ratio of neutrons to protons in the nucleus is too high to be stable.

When the nucleus has a mass of more than 83 amu.

When the ratio of neutrons to protons in the nucleus is not exactly balanced.

Question

When is alpha particle emission most likely to occur?
		
When the nucleus has more than 83 protons.
		
When the ratio of neutrons to protons in the nucleus is too high to be stable.
		
When the nucleus has a mass of more than 83 amu.
		
When the ratio of neutrons to protons in the nucleus is not exactly balanced.

ookawaiioo · Answer

Alpha is Helium with 4/2

When the nucleus has a mass of more than 83 amu