Question

1. choose the best answer. found in air and water, __ is the earth’s most abundant element. iron chlorine carbon oxygen 4. choose the best answer. metalloids have the properties of __ and are elements in the center of the both metals and nonmetals noble gases metals only lanthanide elements

Explanation:

• For the first question, oxygen is the most abundant element on Earth and is present in air (as part of the atmosphere) and water (H₂O).
• For the second question, metalloids have properties intermediate between metals and non - metals.

Answer:

1. D. oxygen
2. A. both metals and nonmetals