Question

1-46 indicate whether each of the following statements about elemental abundances is true or false. a. hydrogen is the most abundant element in both earth’s crust and the universe. b. oxygen and silicon are the two most abundant elements in the universe. c. helium is the second-most abundant element in earth’s crust. d. two elements account for more than three-fourths of the atoms in earth’s crust.

Explanation:

Part a

In the universe, hydrogen is the most abundant element. But in Earth’s crust, oxygen is the most abundant, not hydrogen. So the statement is false.

In the universe, hydrogen is the most abundant, followed by helium. Oxygen and silicon are abundant in Earth’s crust, not the universe. So the statement is false.

In Earth’s crust, the second - most abundant element is silicon, not helium. Helium is abundant in the universe but not in Earth’s crust. So the statement is false.

Answer:

False

Part b