Question

The element capable of gaining as well as losing an electronic is

Answer 1

Hydrogen.. obviously

Answer 2

Hydrogen

Since it loses an electron to become chemically stable as it has an electron and it becomes H+ ion. Since only a proton is only left behind so it is also known as a proton.

Since it gains an electron to become chemically stable as it has an electron and it becomes H- ion.And it attains duplex structure . Hope it helps.