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Foil balloons are filled with helium. Helium is lighter than air and because of this, it is one of the gases that can make a balloon float. It's the preferred gas for these type of balloons because it isn't flammable and is inert, meaning undesired chemical reactions are rare.
Silver is the metal used to make silver foil. It is malleable and can be pounded into very thin sheets, making it ideal for use as foil in various applications like wrapping food or as a decorative element in arts and crafts.
Aluminum.
Either Tin (Sn) or Aluminum (Al) are used in foil wrap. Hope this helps!
Aluminum foil does not contain BPA. BPA is a chemical compound that is used in some plastics, but it is not present in aluminum foil.