Which gas is primarily responsible for the distinct color of neon lights?

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The distinct color of neon lights is primarily due to the gas neon, which emits a bright red-orange light when an electric current passes through it. This phenomenon occurs because the energy from the electric current excites the neon atoms, causing them to release energy in the form of light as they return to their ground state. Each noble gas emits light at specific wavelengths when excited, leading to characteristic colors. In the case of neon, it is well-known for producing this vibrant glow, which is why it is commonly used in neon signs and decorative lighting.

Other gases listed, such as krypton, argon, and helium, have their own unique colors when ionized or excited but do not produce the same unmistakable red-orange hue as neon. Thus, the correct answer reflects the specific light-emitting properties of neon gas, making it the primary contributor to the color of neon lights.