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Why is Xenon a noble gas?

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Xenon is considered noble because the compounds that it forms (the halides) weren’t discovered until much later. By that time, Xenon was already classified as a noble gas and it stuck. It is possible for all noble gases to form compounds, even Helium if enough energy is used. read more

Xenon is a member of the zero-valence elements that are called noble or inert gases. It is inert to most common chemical reactions (such as combustion, for example) because the outer valence shell contains eight electrons. read more

Noble gas. The noble gases (historically also the inert gases) make up a group of chemical elements with similar properties; under standard conditions, they are all odorless, colorless, monatomic gases with very low chemical reactivity. read more

Xenon isn't the only noble gas. Neon, argon, krypton, helium and radon are also noble gases. Like helium, you can fill balloons with xenon, but it is very expensive and the balloon becomes very heavy because the gas is so dense. An average balloon can hold around 40 lbs. read more

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