Question

How alfa beta and gama particle creat in nucleus?

Answer 1

any electrons -- two protons and two neutrons. It has a much greater mass than beta particles, and consequently a much shorter range. Ordinarily, it travels at about a tenth of the speed of light. When a nucleus ejects an alpha particle, its atomic number decreases by 2 and its mass decreases by 4, so it is now a different element. A sheet of tissue paper or the surface layer of your skin is sufficient to stop an alpha particle, so they have relatively little penetrating power.

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Answer 2

alpha particle( helium) is actually created by demolition of nucleus, by it neutron ,proton ratio increases(it is found in heavy atoms like uranium,thorium etc. )
while.
beta particle(electron) is actually released(created) to decrease neutron proton ratio .
it is created when neutron converts into proton and releases of electron
( it is found in elements with low atomic no. like helium, aluminium, magnesium etc...)
Gama ray(not particle) is pure energy that is released when a energised atom wishes to release energy in order to gain stability. It is a secondary emmision and happens after alpha or beta decay.
If neutron -proton ratio is close to one then it is a stable atom. All the three apha,bet decay and gama ray emmision happens in atom to increase its stability.
Theres something like k-shell electron capture, if ya wanna learn about it also, then follow me.