Question

write three differences between alpha particles and Helium atom pointwise

Answer 1

1. Alpha particles consist of two protons and two neutrons bound together into a particle identical  to a helium nucleus.  This is produced in the process of alpha decay.
2. Helium atom is composed  of two electrons in orbit around a nucleus containing two protons along with either one or two  neutrons.
3. The alpha particle is indeed unstable and will react with almost any material in order to obtain the 2 electrons needed to fill its s orbital.

For example:

 Na ---> Na+ (Na+ is more stable)  Cl2 ---> Cl- (Cl- is more stable)  but if you try to do that to a compound that already has a full valence shell, it is destabilizing:  Ag --> Ag+ (Forms a reactive ion)  So alpha particles can't be placed with traditional ions, because they attempt to become stable by ceasing to be ions.

I hope that explains it better.  

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