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A noble gas atom has a completely full outer shell of electrons. Noble gases almost always exist as single atom molecules, rarely bonding with other atoms.

Other element's electron configurations are often expressed by the closest lower numbered Noble gas, then just showing the additional electron shells on top of that configuration, rather than showing the entire electron shell configuration of the element.

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9y ago
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15y ago

To make sure the formula comes out correctely!

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Q: Why is electron arrangement so important?
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