Questions: Which element is most abundant in the Earth's crust? a. Oxygen b. Silicon c. Calcium d. Magnesium Compounds are made up of more than one element. Which of the following represents a compound? a. N2 b. NH3 c. H2 d. All of the above

Which element is most abundant in the Earth's crust? a. Oxygen b. Silicon c. Calcium d. Magnesium Compounds are made up of more than one element. Which of the following represents a compound? a. N2 b. NH3 c. H2 d. All of the above
Transcript text: Which element is most abundant in the Earth's crust? a. Oxygen b. Silicon c. Calcium d. Magnesium 19. Compounds are made up of more than one element. Which of the following represents a compoind? a. $N_{2}$ b. $\mathrm{NH}_{3}$ c. $\mathrm{H}_{2}$ d. All of the above
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Solution

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Solution Steps

Step 1: Most abundant element in Earth's crust

The most abundant element in the Earth's crust is Oxygen.

Step 2: Compound representation

A compound is made up of more than one element. Among the given options, $\mathrm{NH}_{3}$ represents a compound as it consists of Nitrogen and Hydrogen.

Final Answer

$\boxed{a. Oxygen}$

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