What is the change in atomic mass number when an atom emits an alpha particle?
a.
decreases by 2
c.
increases by 2
b.
decreases by 4
d.
increases by 4

B. decreases by 4

Explanation:

When an atom undergoes alpha radiation an alpha particle is emitted. When this happens the atomic mass or mass number of an atom is decreased by four, while the atomic number is decreased by 2.An alpha particle is equivalent to the nucleus of helium atom. Therefore if a particle with mass number 20 and atomic number 10 undergoes an alpha radiation, the new atomic mass will be 16, while the new atomic number will be 8.

B. decreases by 4

Explanation:

When an atom undergoes alpha radiation an alpha particle is emitted. When this happens the atomic mass or mass number of an atom is decreased by four, while the atomic number is decreased by 2.An alpha particle is equivalent to the nucleus of helium atom. Therefore if a particle with mass number 20 and atomic number 10 undergoes an alpha radiation, the new atomic mass will be 16, while the new atomic number will be 8.

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