The Building Blocks of Life Quiz

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Questions and Answers

What is the approximate percentage of oxygen in the Earth's crust?

65%
21%
46% (correct)
78%

What are isotopes?

Different forms of an element with the same number of neutrons but different number of protons.
Different forms of an element with the same number of electrons but different number of protons.
Different forms of an element with the same number of protons but different number of neutrons. (correct)
Different forms of an element with the same number of protons but different number of electrons.

What are the two regions that compose an atom?

Nucleus and orbitals (correct)
Nucleus and protons
Electrons and neutrons
Protons and electrons

Which element constitutes approximately 10% of living organisms (humans)?

<p>Hydrogen (H) (D)</p> Signup and view all the answers

What are elements?

<p>Unique forms of matter with specific chemical and physical properties that cannot be broken down into smaller substances by ordinary chemical reactions. (D)</p> Signup and view all the answers