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：2025/11/20
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(chemistry) Any of the elements of group 18 of the periodic table, being monatomic and (with very limited exceptions) inert.
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Helium, a noble gas, is commonly used to fill weather balloons because it is lighter than air and nonreactive.
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Helium, a noble gas, is commonly used to fill weather balloons because it is lighter than air and nonreactive.
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