Hydrogen, as we all know, has Atomic Number 1 and can be considered as the most basic element known. Hydrogen'd originated from Soldier-Front which meant "one person team." This happens when a situation of 3 or more people goes against only 1 person on the other team and at the end, the lone person wins the round. It basically means 1 man team.
That sniper Hydrogen'd the blue team for three consecutive rounds.