For 10 points, name this gas that consists of two atoms of the element with atomic number 8.
Two of these molecules with antiparallel spins transiently dimerize in the liquid phase, which explains why this molecule defies Curie's law. NASA's space shuttles used a bipropellant system of hydrogen gas and this molecule. According to molecular orbital theory, this substance has two unpaired electrons, which makes it paramagnetic. This allotrope is the most stable form of the first chalcogen. A glowing splint catches fire in the presence of this gas, the second most common gas in Earth's atmosphere. For 10 points, name this gas that consists of two atoms of the element with atomic number 8.
Two of these molecules with antiparallel spins transiently dimerize in the liquid phase, which explains why this molecule defies Curie's law.
diatomic oxygen gas [or dioxygen; or O2] &lt;AG&gt;