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X-rays are indeed a part of the electromagnetic spectrum, which encompasses a range of electromagnetic radiation types, including gamma rays, ultraviolet light, visible light, infrared radiation, microwaves, and radio waves. This classification is based on their wavelength and frequency. X-rays are distinguished by their ability to penetrate various materials, which is why they are commonly used in medical and dental imaging to view the internal structures of the body and teeth.

The other characteristics do not accurately describe X-rays. They cannot be seen with the naked eye, as they are outside the visible light spectrum. X-rays do not possess mass; they are considered massless particles like other forms of light in the electromagnetic spectrum. Additionally, they have significant penetrating power and can pass through soft tissues, which makes them essential for diagnostic imaging in healthcare.