everyday science MCQ #226

Which of the following elements is not present abundantly in the Earth's crust?

everyday science MCQ #226

  1. Question 1

    Q1. Which of the following elements is not present abundantly in the Earth's crust?

    • A) Silicon
    • B) Radium
    • C) Aluminum
    • D) Carbon

    Answer: Radium

    Explanation: Radium is an extremely rare radioactive element with a crustal abundance of only about 1 part per trillion, far less abundant than silicon, aluminum, or carbon.