Interpretation: Difference of mass of an alpha particle and an electron needs to be explained.
Concept introduction: An alpha particle contains two protons and two neutrons. It carries a charge of +2. It is helium atom with no electrons.
An electron is a subatomic particle that has a negative charge and moves freely in an atom.
Answer to Problem 28SSC
An alpha particle is
Explanation of Solution
The mass of all the subatomic particles is as follows:
Mass of an electron
Mass of proton is
Mass of neutron is
Now, in alpha particle there are 2 protons, 2 neutrons and zero electrons. Thus, total mass of an alpha particle can be calculated as follows:
Mass of an alpha particle
Difference
Hence, an alpha particle is
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