Alpha Decay of U-238

What happens to the atomic number (Z) during alpha decay?

• Z increases by 2

• Z decreases by 2

• Z increases by 4

• Z decreases by 4

What happens to the mass number (A) during alpha decay?

• A increases by 2

• A decreases by 2

• A increases by 4

• A decreases by 4

Alpha Decay of U-238: The emitted particle in alpha decay is _______.

• Helium (He)

• Hydrogen (H)

• Carbon (C)

• Oxygen (O)

Fill in the blank: During the beta decay of Th-234, the atomic number (Z) ______ by 1 but the mass number (A) remains the same.

• increases

• decreases

• remains the same

• doubles

Fill in the blank in the following nuclear equation: ³₂He → ³₂He + ___

• ⁰₀γ (gamma ray)

• ¹₀n (neutron)

• ¹₁H (proton)

• ⁴₂He (alpha particle)

Gamma Decay of He-3: True or False: There is no change in both atomic number (Z) and mass number (A) during gamma decay.

• True

• False