Three most occurring elements into the earth crust are : — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

Step 1: Rank the elements in the Earth's crust by their mass percentages: Oxygen (~46.6%) > Silicon (~27.7%) > Aluminium (~8.1%) > Iron (~5.0%). Step 2: This makes Oxygen, Silicon, and Aluminium the three most abundant elements. Step 3: Therefore, the three most occurring elements are O, Si, Al, matching option (a).