Atomic Chemistry 101

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Questions and Answers

Which of the following particles make up the nucleus of an atom?

  • Protons and electrons
  • Protons, neutrons, and electrons
  • Protons and neutrons (correct)
  • Neutrons and electrons

What distinguishes one chemical element from another?

  • The number of protons and neutrons
  • The number of neutrons
  • The number of protons (correct)
  • The number of electrons

What defines the isotope of an element?

  • The number of electrons
  • The number of protons
  • The number of protons and electrons
  • The number of neutrons (correct)

Why can't humans see atoms with conventional microscopes?

<p>Atoms are too small (A)</p> Signup and view all the answers

What percentage of an atom's mass is located in the nucleus?

<p>99.94% (D)</p> Signup and view all the answers

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