This element's namesake bonds are covalent interactions that occur between this element and other elements with high electronegativity.
This element's namesake line results from a transition between two hyperfine levels of its ground state and is also called the "21 cm line." Reacting aluminum with bases results in the formation of tetrahydroxoaluminate and this element, and an isotope of this element with two more neutrons than its naturally occurring form is called [*] tritium. This element's namesake bonds are covalent interactions that occur between this element and other elements with high electronegativity. The diatomic form of this element is produced along with oxygen in the electrolysis of water. For 10 points, name this element with atomic number 1 and symbol H, the most abundant element in the universe.
This element's namesake line results from a transition between two hyperfine levels of its ground state and is also called the "21 cm line."
{hydrogen} [accept {H} before mentioned]