You are such a weedle for asking this question because the answer is so simple. it is Dexter is cool
Hydrogen
Hydrogen an react with oxygen to form water and not helium
Hydrogen is dangerous than Helium because Hydrogen is a stronger gas than Helium.
hydrogen helium oxygen nitrogen phosphorus aluminium nickel calcium barium magnesium oxygen sulphur helium neon tin mercury
Nitrogen is heavier than hydrogen but lighter than oxygen. In terms of molecular weight, nitrogen has a molar mass of about 28 g/mol, oxygen has a molar mass of about 32 g/mol, and hydrogen has a molar mass of about 2 g/mol.
Sulphur, Oxygen, Hydrogen, Xenon, Neon, Nitrogen, Helium, Magnesium, Lead, Copper, Iron, Plutonium, Uranium, Iodide, Carbon, Californicum, etc.
All of them. There are no elements lighter than hydrogen. It has only two atomic particles, and you cannot have an element with less.
Helium, oxygen, and hydrogen.
Oxygen, Hydrogen and Helium.
Hydrogen, Helium, Oxygen.
hydrogen, helium, oxygen.
hydrogen is the lightest element