Atomic Structure Basics
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Questions and Answers

What is the commonly used term for the particles consisting of protons and neutrons in a nucleus?

  • Electrons
  • Photons
  • Isotopes
  • Nucleons (correct)

What is the term for the number of protons in a nucleus?

  • Mass defect
  • Atomic number (correct)
  • Atomic mass number
  • Atomic weight

What does the atomic mass number represent?

  • Energy level of a nucleus
  • Number of electrons in a nucleus
  • Number of isotopes in a nucleus
  • Total number of nucleons in a nucleus (correct)

Who were the first scientists to propose that matter is made of indivisible parts called atoms?

<p>Leucippus and Democritus (B)</p> Signup and view all the answers

Who discovered electrons in 1887, disproving the indestructibility of atoms proposed by Dalton?

<p>J. J. Thomson (D)</p> Signup and view all the answers

What did Ernest Rutherford discover about the structure of an atom?

<p>The nucleus contains all the positive charge of the atom and most of its mass (A)</p> Signup and view all the answers

What did Niels Bohr contribute to the atomic model?

<p>Improved upon the atomic model proposed by J. J. Thomson (A)</p> Signup and view all the answers

What did Greek philosophers Leucippus and Democritus propose about matter?

<p>Matter is made of indivisible parts called atoms. (B)</p> Signup and view all the answers

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