The correct answer is $\boxed{\text{ion}}$.
After removing two electrons from a helium atom, it becomes a helium ion with a charge of +2. This is because the helium atom has two protons in its nucleus, and two electrons in its electron shell. When two electrons are removed, the atom has a net positive charge of +2.
Alpha particles, beta particles, and gamma rays are all types of radiation. Alpha particles are positively charged helium nuclei, beta particles are high-energy electrons, and gamma rays are high-energy photons.
UV rays are a type of electromagnetic radiation with a wavelength shorter than visible light but longer than X-rays. They are produced by the sun and other sources of ultraviolet radiation.
X-rays are a type of electromagnetic radiation with a wavelength shorter than UV rays. They are produced by X-ray machines and other sources of X-rays.
I hope this helps! Let me know if you have any other questions.