The residual atom after this change has an atomic number of 82 and a mass number of 195.
What is alpha particle?
Two protons and two neutrons are closely bonded together to form alpha particles, which are composite particles. During an event known as alpha-decay, they are released from the nucleus of some radionuclides. A normal (atomic mass four) helium atom, or a doubly ionised helium atom, has a nucleus that is identical to that of an alpha particle.
What is atomic number?
The quantity of protons in an atom is known as its atomic number.
What is mass number?
The protons and neutrons in an atom are added to determine the mass number.
Thus, an alpha particle has two protons and two neutrons. As one alpha particle decays, the atomic number drops by two and its mass drops by four. For that the residual atom after this change has an atomic number of (84-2) = 82 and a mass number of (199-4) = 195.
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