Question: what are the two most common elements in the solar system
Answer: Most abundant nuclides in the Solar System Nuclide Mass fraction in parts per million Atom fraction in parts per million Hydrogen - 1 705,700 909,964 Helium - 4 275,200 88,714 Oxygen - 16 16 9,592 477 Carbon - 12 12 3,032 326 Nitrogen - 14 14 1,105 102 Neon - 20 20 1,548 100 Other nuclides : 3,879 149 Silicon - 28 28 653 30 Magnesium - 24 24 513 28 Iron - 56 56 1,169 27 Sulfur - 32 32 396 16 Helium - 3 35 15 Hydrogen - 2 23 15 Neon - 22 22 208 12 Magnesium - 26 26 79 Carbon - 13 13 37 Magnesium - 25 25 69 Aluminium - 27 27 58 Argon - 36 36 77 Calcium - 40 40 60 Sodium - 23 23 33 Iron - 54 54 72 Silicon - 29 29 34 Nickel - 58 58 49 Sil