a simple ques

how cum any one of these be unstable?
any 1 explain.

α particle?

That's the odd one out [3]

nuetron , proton n electron together r very stable..........

but alpha nahi sayad.........

wel i think its neutron coz i never saw it outside the nucleus any time..........tht is i think it is stable only inside the nucleus.......I MAY BE WRONG..........so i think it is unstable outside the nucleus......

Akand you are right But please explain it better

A neutron is unstable when it is outside of the nucleus. Then it is called a "free neutron" and generally undergoes Beta decay to stabilize.

a free neutron,free electron , free proton are unstable

becos a neutral charged particle will be more stable than a charged particle but in case of neutron the nuclear force is predominantly higher. it always ready to bind the charges