Question

mass of alpha partical​

Answer 1

Alpha particle consists of two neutrons and two protons, and is thus identical to the nucleus of a helium atom. The rest mass of the alpha particle amounts to 4 a.m.u which equals to about 6.644×10^-27 kg and its charge is +2e ie twice of a proton.

Answer 2

HERE IS YOUR ANSWER

Mass of alpha particle is 4 amu

OR

6.644×10^-27 kg