Which statement best describes the process of alpha decay?

Question

an unstabble nucleus releases an electron
an unstable nucleus releases a particle containing two protons and two neutrons
an unstable nucleus rearrange its particles and releases energy
an unstable nucleus releases a single positively charged particle

Answer 1

The statement that best describes the process of alpha decay is: an unstable nucleus releases a particle containing two protons and two neutrons.

This particle, called an alpha particle, is a common type of decay for heavy atomic nuclei, leading to a decrease in the atomic number by 2 and the mass number by 4.