Which element is the most abundant in the atmospheres of Jupiter and Saturn?

• A. Hydrogen (H)
• B. Oxygen (O)
• C. Nitrogen (N)
• D. Helium (He)

Answer: (A)

Verified step by step guidance

1. Understand that the question is about the composition of the atmospheres of Jupiter and Saturn, which are gas giant planets in our solar system.
2. Recall that Jupiter and Saturn are primarily composed of light gases, mainly hydrogen and helium, unlike Earth which has nitrogen and oxygen-rich atmosphere.
3. Recognize that hydrogen is the most abundant element in the universe and is the primary component of gas giants' atmospheres.
4. Helium is the second most abundant element in these atmospheres, but less abundant than hydrogen.
5. Conclude that among the given options, hydrogen (H) is the most abundant element in the atmospheres of Jupiter and Saturn.