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recommend an element use to fill bottles that contain ancient paper. the element should be a gas at room temperature, should be denser than helium, and should not easily react with other elements. Help
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recommend an element use to fill bottles that contain ancient paper. the element should be a gas at room temperature, should be denser than helium, and should not easily react with other elements. Help please hurry

User Remorath
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Neon is heavier than helium and does not react with other elements. This is because Neon is a noble gas and is very stable because its outer electrons are filled.
User James Poag
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