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From what I've learnt, an alpha particle is identical to the nucleus in that it has two protons and two neturons; mass 4 and atomic number 2.Maybe your teacher meant it isn't 'helium', as in it isn't a monatomic gas with those properties.sker's rating. Report Abuse. From what I've learnt, an alpha particle is identical to the nucleus in that it has two protons and two neturons; mass 4 and atomic number 2. Maybe your teacher meant it isn't 'helium', as in it isn't a monatomic gas with those properties.