Hydrogen accepts an electron to achieve the inert gas configuration. In this process,it behaves like which of the following?

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

$A$ deuteron contains

The number of hydrogen molecules possible from its isotopes is

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Physical properties of isotopes of hydrogen are different.
Reason $R$: Mass difference between isotopes of hydrogen is very large.
In the light of the above statements,choose the correct answer from the options given below:

The maximum sum of the number of neutrons and protons in an isotope of hydrogen is