context: In the triplet form, O
  2 molecules are paramagnetic. That is, they impart magnetic character to oxygen when it is in the presence of a magnetic field, because of the spin magnetic moments of the unpaired electrons in the molecule, and the negative exchange energy between neighboring O
  2 molecules. Liquid oxygen is attracted to a magnet to a sufficient extent that, in laboratory demonstrations, a bridge of liquid oxygen may be supported against its own weight between the poles of a powerful magnet.[c]
question: ప్రయోగాలలో, అయస్కాంత ధ్రువాల మధ్య ఏ మూలకం యొక్క వంతెనను నిర్మించవచ్చు?
answers: Liquid oxygen liquid oxygen liquid oxygen oxygen liquid oxygen