During beta decay, which particle is emitted from the nucleus?

• A. An alpha particle
• B. An electron (beta minus particle)
• C. A proton
• D. A neutron

Answer: (B)

Verified step by step guidance

1. Understand that beta decay is a type of radioactive decay where a nucleus emits a beta particle to transform into a different element or isotope.
2. Recall that in beta minus decay, a neutron inside the nucleus is converted into a proton, and this process emits a beta particle.
3. Recognize that the beta particle emitted during beta minus decay is an electron, which is ejected from the nucleus.
4. Note that an alpha particle consists of 2 protons and 2 neutrons and is emitted during alpha decay, not beta decay.
5. Conclude that during beta minus decay, the emitted particle is an electron (also called a beta minus particle).