Final answer:
X-rays and gamma rays are the parts of the electromagnetic spectrum that can ionize molecules and/or atoms.
Step-by-step explanation:
The parts of the electromagnetic spectrum that can ionize molecules and/or atoms are the X-rays and gamma rays. The parts of the electromagnetic spectrum that can ionize molecules and/or atoms are the high-energy wavelengths, particularly X-rays and gamma rays. These wavelengths have enough energy to remove tightly bound electrons from atoms, creating ions. The process of ionization is significant because it can lead to chemical changes in substances and can cause damage to living tissues. The ability to ionize atoms is a critical aspect when studying radiation effects on matter, as it relates to the health and safety impacts of radiation exposure.