Multiple Choice
Which two elements are the most abundant in Earth's crust?
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2. Atoms & Elements
Periodic Table: Representative Elements & Transition Metals
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Which of the following lists contains the five most common elements found in the human body?
A
O, C, H, N, Ca
B
H, He, O, N, C
C
O, Fe, Na, K, Cl
D
C, H, N, S, P
Verified step by step guidance1
Understand that the question asks for the five most common elements in the human body by abundance, which are primarily those that make up biological molecules and structural components.
Recall that the majority of the human body's mass is made up of oxygen (O), carbon (C), hydrogen (H), and nitrogen (N), as these elements are fundamental to water, proteins, lipids, and nucleic acids.
Recognize that calcium (Ca) is also among the top five because it is a major component of bones and teeth, contributing significantly to the body's elemental composition.
Compare the given lists to see which one contains these five elements: O, C, H, N, and Ca.
Conclude that the list containing O, C, H, N, and Ca correctly represents the five most common elements found in the human body.
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