Amaterial is nonmagnetic and gaseous and does not conduct heat or electricity. it will, however, react with other elements. it is most likely a noble gas metalloid nonmetal metal

The correct option is: Nonmetal

Explanation:

Non-metals are the chemical elements that are generally present in the gaseous state at room temperature and have low electrical and thermal conductivity. These elements are non-magnetic and tend to have low density, boiling point and melting point. Non-metals have high electronegativity and ionization energy and react by sharing or gaining electrons from the other elements.

Therefore, the given material is most likely a non-metal.

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask