Which one of the following is present in the largest amount in terms of per cent by mass in the Earth’s crust?

1. Silicon
2. Oxygen
3. Carbon
4. Calcium

Explanation

Option (b) is correct

• Oxygen is the most abundant element in the Earth’s crust by mass, constituting about 46.6% of its total weight. It occurs mainly in combination with other elements, forming oxides and silicate minerals such as silica (SiO₂), alumina (Al₂O₃), and various silicates.

Answer: (b) Oxygen