Find answers to your questions faster and easier with IDNLearn.com. Ask your questions and get detailed, reliable answers from our community of knowledgeable experts.

When an unstable nucleus decays by emitting an alpha particle, the atomic number Z of the nucleus:
A) Increases by 4.
B) Increases by 2.
C) Decreases by 2.
D) Decreases by 4.
E) Remains unchanged.