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Q: Which of the following elements occurs most abundantly in our universe?
  • A. Nitrogen
  • B. Oxygen
  • C. Helium
  • D. Hydrogen
Correct Answer: Option D - Hydrogen is more plentiful than any other element making up about 3/4th i.e 75% of the mass of the universe. Hydrogen and helium make up the majority of the star, with hydrogen at 75% and helium at 23%. Oxygen is third most abundant element of universe. On earth, oxygen is the most common element making up about 47% of earth's mass. Note: Earth's atmosphere is a layer of gases surrounding the planet Earth and retained by the Earth's gravity. It contains roughly 78% nitrogen and 21% oxygen 0.97% argon and carbon dioxide 0.04% trace amounts of other gases, and water vapor.
D. Hydrogen is more plentiful than any other element making up about 3/4th i.e 75% of the mass of the universe. Hydrogen and helium make up the majority of the star, with hydrogen at 75% and helium at 23%. Oxygen is third most abundant element of universe. On earth, oxygen is the most common element making up about 47% of earth's mass. Note: Earth's atmosphere is a layer of gases surrounding the planet Earth and retained by the Earth's gravity. It contains roughly 78% nitrogen and 21% oxygen 0.97% argon and carbon dioxide 0.04% trace amounts of other gases, and water vapor.

Explanations:

Hydrogen is more plentiful than any other element making up about 3/4th i.e 75% of the mass of the universe. Hydrogen and helium make up the majority of the star, with hydrogen at 75% and helium at 23%. Oxygen is third most abundant element of universe. On earth, oxygen is the most common element making up about 47% of earth's mass. Note: Earth's atmosphere is a layer of gases surrounding the planet Earth and retained by the Earth's gravity. It contains roughly 78% nitrogen and 21% oxygen 0.97% argon and carbon dioxide 0.04% trace amounts of other gases, and water vapor.