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The two most common ones are hydrogen and helium gas
The most common elements in space are Nitrogen and Oxygen. There is also Hydrogen and Argon. Surprisingly, there is more Nitrogen in space than Oxygen.
The two most important elements on the Jovian planets are hydrogen and heliumn
The two most abundant elements in a main sequenced star are Hydrogen(H) and Helium(He).
hydrogen and helium
The two most common elements in the Universe, and in most stars are - in that order - hydrogen and helium (elements #1 and #2).
Oxygen and silicon are the two most abundant elements found in the most common minerals. The most common minerals found on Earth are silicates.
Hydrogen and Helium are the two most common elements in the universe.
Hydrogen and helium.
Oxygen & Silicone.
This question depends on what importance is being assigned. The most common dissolved ions (elemental atoms do not dissolve) are sodium and chloride, but they are many other important elements found in sea water.
Hydrogen, followed by helium.
Hydrogen and helium.
oxygen and silicon
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the most common element is hydrogen and its molecule of two hydrogen atoms is the most common molecule
silicon and oxygen