What is the sum of the number of neutrons and protons in the heaviest isotope of hydrogen?

Out of the two allotropic forms of dihydrogen,the form with lesser molecular energy is

Explain the commercial production of $Dihydrogen$.

The basic principle of the hydrogen economy is the transportation and storage of energy in the form of liquid or gaseous hydrogen. Which property of hydrogen may be useful for this purpose? Support your answer with a chemical equation if required.

The sum of protons,electrons and neutrons in the heaviest isotope of hydrogen is

Justify the position of hydrogen in the periodic table on the basis of its electronic configuration.