Atomic Structure and Quantum Mechanics

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Questions and Answers

What is the magnitude of electric charge for electrons?

  • 9.11*10-31C
  • 1.67*10-27C
  • 1.60*10-18C
  • 1.60*10-19C (correct)

What is the approximate mass of protons and neutrons?

  • 9.11 *10-31 kg
  • 1.67 *10-19 kg
  • 1.67 *10-27 kg (correct)
  • 1.60*10-19 kg

What characterizes each chemical element?

  • The number of neutrons
  • The number of protons in the nucleus (correct)
  • The number of electrons
  • The atomic mass

What is the range of atomic number?

<p>From 1 to 92 (C)</p> Signup and view all the answers

What is the atomic mass (A) of a specific atom expressed as?

<p>The sum of the masses of protons and neutrons within the nucleus (C)</p> Signup and view all the answers

What are atoms of some elements with two or more different atomic masses called?

<p>Isotopes (A)</p> Signup and view all the answers

What is the significance of the atomic number (Z) for an electrically neutral or complete atom?

<p>It equals the number of electrons (D)</p> Signup and view all the answers

What is the mass of an electron?

<p>9.11 *10-31 kg (B)</p> Signup and view all the answers

What is the difference between protons and neutrons?

<p>Protons are electrically charged, while neutrons are electrically neutral (D)</p> Signup and view all the answers

What is the main difference between atoms of the same element with different atomic masses?

<p>The number of neutrons (B)</p> Signup and view all the answers

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