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)</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.</p> Signup and view all the answers

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