Watch what happens Here are five of the six noble gases: helium, neon, argon, kypton and xeon. They're all colourless and transparent. Krypton and xeon form compounds only with difficulty. Helium, neon and argon don't form compounds at all. As we descend the group in the periodic table the atomic number and relative atomic mass increases. The gasses get denser. Helium - helium is lighter than air. Neon is just lighter. Argon and krypton - I've just got to unstick these from the anchorage Argon and krypton are both heavier than air.
And xeon, xeon is the heaviest of the lot, you've heard of a lead balloon, well this is it. The noble gases, in order of their density, are helium, neon, argon, krypton, xenon and radon. For this reason they are also known as inert gases. Most of the noble gases are extracted from the air, except for helium. Helium is a product of radioactive decay the alpha particle and is found naturally in rocks. Helium, the lightest, is used for filling party balloons.
Neon is probably most famous for neon signs — a tube containing neon gas through which a current is passed which causes the gas to give out light.
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Share Flipboard Email. Anne Marie Helmenstine, Ph. Chemistry Expert. Helmenstine holds a Ph. She has taught science courses at the high school, college, and graduate levels.
Facebook Facebook Twitter Twitter. Argon is:. Filament lamps contain thin metal wires. These become very hot and glow brightly when an electric current is passed through them.
Explain why argon, krypton or xenon are used in these lamps. The hot metal wires will burn away if any oxygen from air is present in the lamp. Argon, krypton and xenon are very unreactive. All the gases need to maintain their stability is a consistent environment.
Helium is the most abundant element in the universe, and, in a strange twist, we found it on the sun before we discovered it here on Earth! It gets its name from Helios, the Greek god of the sun. Neon is one of many noble gasses that scientists discovered while studying liquified air. Most of the noble gasses make up a small portion of the air we breathe. Neon, for example, accounts for 0. It might not sound like much, but argon is the most abundant noble gas in the atmosphere, making up 0.
It even gets its name from the Greek word argos, meaning inactive. Xenon only makes up 0. It shares its name with the Greek word for stranger because it can be so hard to find.
Radon is colorless and odorless, just like the rest of the members of the noble gas family. There is very little radon gas in the atmosphere at any given time, but the decay of radioactive elements like radium and uranium creates more.
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