A. What is the mass number of an alpha particle?

b. What is the identity of an alpha particle?

c. What kind of charge does an alpha particle have?

a) Answer is: mass number of an alpha particle is is 4.

Muss number is sum of protons and neutrons.

b) Answer is: alpha particle is nucleus of a helium-4 atom, which is made of two protons and two neutrons.

For example, nuclear reaction: ²³⁸U → ²³⁴Th + α (alpha particle).

Alpha decay is radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and transforms into an atom with an atomic number that is reduced by two and mass number that is reduced by four.

c) Answer is: alpha particle has positive charge + 2, because it has two protons.

Protons (positive particles) and neutrons (neutral particles) are in the nucleus of an atom.