Reaction between the following pairs will produce $H_2$ except:

The number of neutrons and electrons,respectively,present in the radioactive isotope of hydrogen is:

Fill in the blanks:
$(1)$ In the crystal structure of ice, the oxygen atom is at a distance of $276 \ pm$ from four hydrogen atoms.
$(2)$ The relative proportion of tritium to protium is $1: 10^{18}$.

Lithium hydride can be used to prepare other useful hydrides. Beryllium hydride is one of them. Suggest a route for the preparation of beryllium hydride starting from lithium hydride. Write chemical equations involved in the process.

Tritium is the isotope of

Hydrogen has higher ionization energy than alkali metals,due to its