What type of radiation consists of 2 protons and 2 neutrons?

Alpha radiation consists of 2 protons and 2 neutrons, which make up an alpha particle. This type of radiation is emitted during the decay of heavy radioactive elements, such as uranium and radium. When an atom undergoes alpha decay, it releases an alpha particle, resulting in the loss of 2 protons and 2 neutrons from the nucleus. This process changes the original atom into a different element, reducing its atomic number by 2 and its mass number by 4.

In contrast, beta radiation involves the emission of electrons or positrons and does not involve protons and neutrons being ejected in the same way. Gamma radiation consists of high-energy electromagnetic waves and does not contain particles like protons or neutrons. X-ray radiation is also a form of electromagnetic radiation, but it serves different purposes mainly in medical imaging. Thus, the unique structure of alpha radiation — specifically the combination of 2 protons and 2 neutrons — distinguishes it as the correct answer.