Which of the following hydrides is neutral?

The hydride ion $H^{-}$ is isoelectronic with which of the following?

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

What happens when ionic hydrides of $s$-block elements in molten state are electrolysed?

Isotope$(s)$ of hydrogen which emits low energy $\beta^{-}$ particle with $t_{1/2}$ value $> 12 \ years$ is/are :

Which property among the following is the same for both hydrogen and deuterium molecules?