Final answer:
Alpha and beta are the particulate forms of ionizing radiation, while gamma rays and X-rays are electromagnetic radiation.
Step-by-step explanation:
Among the types of radiation listed, alpha and beta are particulate forms of ionizing radiation, while gamma rays and X-rays are forms of electromagnetic radiation. Alpha particles are composed of two protons and two neutrons, forming a helium nucleus. Beta particles are high-energy, high-speed electrons or positrons emitted by certain types of radioactive nuclei. Gamma rays, though highly penetrating and capable of causing ionization in materials they pass through, are not particles but rather a type of high-energy electromagnetic radiation, similar to X-rays but more powerful.