There are 9 heavy atoms.
The process of nuclear fusion combines hydrogen atoms to create helium and the energy that makes the sunshine. Three elements heavier than helium, lithium, beryllium, and boron can form as intermediates during the fusion process. Helium has monatomic molecules and is the lightest of all gases except hydrogen.
Like other noble gases, helium is chemically inert. Its single electron shell is full, which makes it very difficult to react with other elements and the resulting compound is highly unstable. Hydrogen is another gas that is lighter than air. Lighter than helium. Helium is less dense than air. Helium is 0.0114 pounds per cubic foot. The increase in mass is due to oxygen in the air combining with magnesium to form magnesium oxide.
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