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Elements for Kids

Noble Gases

• A full outer shell of electrons. Helium has two electrons in its outer shell and the rest have eight electrons.
• Because of their full outer shells, they are very inert and stable. This means they don't tend to react with other elements to form compounds.
• They are gases under standard conditions.
• They are colorless and odorless.
• Their melting and boiling points are close together giving them a very narrow liquid range.

• Because helium is non-flammable it is much safer to use in balloons than hydrogen.
• Krypton gets its name from the Greek word "kryptos" meaning "the hidden one."
• Many of the noble gases were either discovered or isolated by Scottish chemist Sir William Ramsay.
• Helium has the lowest melting and boiling points of any substance.
• All of the noble gases except for radon have stable isotopes.
• Neon signs do not use just neon gas, but a mixture of different noble gases and other elements to create bright lights of different colors.
• Noble gases are often used to create a safe or inert atmosphere due to their stable nature.
• Xenon gets its name from the Greek word "xenos" which means "stranger or foreigner."

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