Beatrice Lang
Neon is a noble gas that glows red-orange when an electric current is passed through it. This phenomenon occurs due to the excitation of its electrons when electricity is applied, causing them to move to a higher energy state. As the electrons return to their original state, they release energy in the form of reddish-orange light. Neon is commonly used in various commercial applications, most famously in neon lights and signs.
| Characteristics | Values |
|---|---|
| Chemical Element | Ne |
| Atomic Number | 10 |
| Type of Gas | Noble Gas |
| Color | Red-Orange |
| Odor | Odorless |
| Reactivity | Less Reactive |
| Phase | Gas |
| Density | Two-thirds of air |
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What You'll Learn
Neon gas glows red-orange with electricity
Neon is a noble gas with the chemical notation Ne. Noble gases like helium, neon, argon, krypton, xenon, and radon are known for their lack of reactivity and chemically inert nature. Neon is particularly famous for its distinctive red glow in lighting applications, such as neon signs and lamps.
Neon lights work by passing an electrical current through neon gas in a sealed tube, causing the gas to become excited and shine a bright light. When an electric current passes through a tube filled with neon gas, the electrons in the neon atoms become excited and move to a higher energy state. As these electrons return to their original state, they release energy in the form of light.
The specific wavelengths of light emitted by neon correspond to the reddish-orange glow typical of neon signage. The color of the light produced depends on how far apart the excited energy is from the original energy. Like the distance between rungs of a ladder, this is a set interval. So, each excited electron of a neon atom releases a characteristic wavelength of photon, resulting in a reddish-orange light.
Neon is commonly used in various commercial applications, most famously in neon lights and signs. These lights became popular in the mid-20th century and are often associated with bright, colorful advertisements.
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This phenomenon occurs due to the excitation of electrons
The phenomenon of a red-orange glow when electricity is passed through a substance is due to the excitation of electrons. This occurs when electricity is passed through a tube filled with a specific gas, in this case, neon. The electrons in the neon atoms become excited and move to a higher energy state. As these electrons return to their original state, they release energy in the form of light, with the specific wavelengths of light emitted corresponding to the reddish-orange glow typical of neon signage.
Neon is a noble gas, and these elements are characterised by each atom having a filled electron shell. This means that the atoms do not react with other atoms and it takes a lot of energy to remove an electron. In the case of neon lights, an electric current is passed through a glass tube filled with low-pressure neon gas. This causes the gas to become excited and shine a bright light. The colour of the light produced depends on how far apart the excited energy is from the original energy, with each excited noble gas releasing a characteristic colour of light.
For neon, this light is a reddish-orange colour. This is because the specific wavelengths of light emitted by neon correspond to the reddish-orange part of the light spectrum. Other noble gases emit different colours when electrified; for example, argon produces a blue-purple light, while krypton gives off a whitish light. The colour of light emitted by a gas can also be altered by coating the glass tube with a phosphor or other chemical that will glow a certain colour when energised.
The phenomenon of a substance glowing red-orange when electricity is passed through it is, therefore, due to the excitation of electrons in the substance's atoms, causing them to move to a higher energy state. When the electrons return to their original state, they release energy in the form of light, with the specific wavelength of light emitted corresponding to the reddish-orange colour.
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Other gases can be used to produce different colours
The element that glows red-orange with electricity is neon, a noble gas. When electricity energises neon gas within a tube, it emits a reddish-orange light, characteristic of 'neon' lighting.
The colour of the light produced also depends on the energy supplied to the light. There are different energy levels available to excited electrons, which correspond to a spectrum of light that the element can produce.
Another way to produce different colours is to coat the glass with a phosphor or other chemical that will glow a certain colour when it is energised. For example, mercury combined with a phosphor coating produces a fluorescent lamp.
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The colour of light produced depends on the distance between energy levels
The phenomenon of certain elements glowing when electricity is passed through them is due to the way these elements interact with electricity. When an electric current passes through a tube filled with a specific gas, the electrons in the atoms become excited and move to a higher energy state. As these electrons return to their original state, they release energy in the form of light.
The colour of light, therefore, depends on its wavelength and energy. Light towards the red end of the spectrum has longer wavelengths and lower energy than light towards the violet end. This is why neon, for example, emits reddish-orange light when energised. Other noble gases emit different colours of light when electrified: argon produces a blue-purple light, krypton gives off a whitish light, and helium glows pink.
The colour of light produced can also be altered by coating the glass tube with a phosphor or other chemical that will glow a certain colour when energised. Modern lights often use a mixture of gases to produce colours.
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Noble gases are used due to their lack of reactivity
Neon is the element that glows red-orange when electricity is passed through it. This phenomenon occurs due to the way neon interacts with electricity. When an electric current passes through a tube filled with neon gas, the electrons in the neon atoms become excited and move to a higher energy state. As these electrons return to their original state, they release energy in the form of reddish-orange light.
Neon is a noble gas, and noble gases are used due to their lack of reactivity. Noble gases are chemically inert and have a low tendency to participate in chemical reactions. This inertness is due to their electron configuration; their outer shell of valence electrons is "full", so they have no tendency to lose, gain, or share electrons. Their low reactivity makes them useful in applications where chemical reactions are unwanted. For example, argon is used as a shielding gas in welding and as a filler gas in incandescent light bulbs.
Noble gases have the largest ionization potential among the elements of each period, reflecting the stability of their electron configuration. Their low reactivity also makes them useful in lighting applications. Argon, for instance, is used in incandescent light bulbs, while krypton is used in high-performance light bulbs to increase efficiency and reduce filament evaporation.
Noble gases are also used in applications where their lack of reactivity is advantageous. Helium, for instance, is used as a lifting gas in balloons and airships due to its low density and lack of reactivity. Additionally, helium and neon are used as refrigerants due to their low boiling points.
The lack of reactivity in noble gases also makes them useful in controlling chemical reactions. Argon, for example, is used as a filler gas in incandescent light bulbs to prevent the filament from reacting with oxygen and burning out. Overall, the lack of reactivity of noble gases makes them valuable in a variety of applications, from lighting to refrigeration to industrial processes.
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Frequently asked questions
The element that glows red-orange with electricity is neon.
When electricity passes through a tube filled with neon gas at low pressure, it excites the electrons in the neon atoms. As these electrons return to their original state, they release energy in the form of reddish-orange light.
Neon lights are widely used for signage and decorative lighting due to their vivid, bright, and colourful appearance.
Yes, other noble gases like argon, krypton, xenon, and helium can produce different colours when electrified. For example, argon emits a blue-purple light, krypton gives off a whitish light, xenon produces a blue glow, and helium glows pink.
