That isotope was discovered by Harold Urey.
Two atoms of this element are appended in the Birch Reduction. One isotope of this element replaces a lighter isotope in a chloroform derivative used as a solvent in NMR. That isotope was discovered by Harold Urey. A compound in which this element is combined with oxygen is broken down by the enzyme catalase (CAT-uh-"lace"). Isotopes of this element include deuterium (doo-TAIR-ee-um) and tritium. Two of this element fuse to create helium. For 10 points, name this lightest element.
Two atoms of this element are appended in the Birch Reduction.
{hydrogen} [or {H} ]