 Xenon can also form <unk> fullerene compounds , where a xenon atom is trapped inside a fullerene molecule . The xenon atom trapped in the fullerene can be monitored via 129Xe nuclear magnetic resonance ( NMR ) spectroscopy . Using this technique , chemical reactions on the fullerene molecule can be analyzed , due to the sensitivity of the chemical shift of the xenon atom to its environment . However , the xenon atom also has an electronic influence on the reactivity of the fullerene . 
