Table:Question 1 All of these elements are metals except
Select one:
helium.
gold.
sodium.
aluminum

Helium is nonmetal

Explanation:

At immense pressures (such as what exists in the center of gas giant planets like Jupiter and Saturn), both Helium and Hydrogen enter a metallic state, where both will conduct electricity. Helium turns into a liquid metal similar to Mercury. So, helium can be a metal.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.