Usually in Gas form.
Helium, hydrogen, and air are gases.
helium and hydrogen
Hydrogen and helium make up nearly 100 percent of the matter of the universe. Hydrogen comprises about 75 percent and helium makes up about 25 percent.
Hydrogen and Helium
Hydrogen and helium. :)
Helium has 2 valence electrons and hydrogen has 1 electron. So, they are placed in different groups.
Hydrogen and helium were mainly produced during the Big Bang, the event that created the universe. Roughly 75% of the normal matter in the universe is hydrogen and about 25% is helium. These elements have since played a fundamental role in the formation and evolution of all other elements in the universe through processes like nuclear fusion in stars.
The symbol for hydrogen is H, and the symbol for helium is He.
Nuclear fusion (hydrogen to helium).
Helium and hydrogen
Hydrogen & helium
Examples of gas: oxygen, hydrogen, methane, helium, radon, etc.