Question

The most abundant element in earth's crust is:

• A. Hydrogen
• B. Oxygen
• C. NItrogen
• D. Silicon

Answer 1

The correct option is B

Oxygen

The explanation for the correct option:

B. Oxygen

Elements:

• “An element is a basic form of matter that cannot be broken down into simpler substances by chemical reactions.”
• Elements can be metals/non-metals/metalloids.
• Examples of elements are Iron $\left(\mathrm{Fe}\right)$, Sodium $\left(\mathrm{Na}\right)$, or Gold $\left(\mathrm{Au}\right)$.

The most abundant element by mass present in Earth's crust is Oxygen. Oxygen is an element that is highly reactive and also easily combines with other elements. The percentage of oxygen that is found in Earth's crust is $46\%$ which is greater than Hydrogen, Silicon as well as Nitrogen.

The explanation for incorrect options:

Oxygen is the most abundant element in Earth's crust. Thus options A, C, and D are incorrect.

Hence, the correct option is B i.e. Oxygen.