Definitions for "alpha particle"
a particle emitted at high velocity from certain radioactive substances. It is identical to the helium nucleus, consisting of two protons and two neutrons. Rays of such particles are called alpha rays.
a cluster of 2 protons and 2 neutrons emitted from a nucleus in one type of radioactivity.
Helium nucleus: two protons, two neutrons, NO electrons. Alpha particles are ions.
Keywords:  lewis, boiling, constant, solution, gas
constant boiling solution gas Lewis base physical change temperature