Which of the following elements is the least abundant in the Earth's crust?

• A. Gold
• B. Oxygen
• C. Aluminum
• D. Silicon

Answer: (A)

Verified step by step guidance

1. Identify the elements listed in the problem: Gold, Oxygen, Aluminum, and Silicon.
2. Understand that the abundance of elements in the Earth's crust is typically measured by weight percentage.
3. Recall that Oxygen is the most abundant element in the Earth's crust, followed by Silicon and Aluminum.
4. Recognize that Gold is a precious metal and is much less abundant in the Earth's crust compared to the other elements listed.
5. Conclude that Gold is the least abundant element among the options provided.