Atomic Fundamentals
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Questions and Answers

Which one of these is true about atoms?

  • Atoms are the smallest part and building block of elements
  • Atoms are made up of neutrons, protons, and electrons
  • Atoms have the same number of protons and electrons
  • All of the above (correct)

    • What are neutrons and protons?

  • Neutrons and protons are located in the nucleus of an atom (correct)
  • Neutrons and protons revolve around the nucleus in an orbital
  • Neutrons and protons have a positive charge
  • Neutrons and protons are elementary particles

    • What is the charge of an electron?

  • Positive (+)
  • Negative (+) (correct)
  • Neutral
  • None of the above

    • What is the mass of an electron relative to a proton?

    <p>0.0005</p> Signup and view all the answers

    What is the atomic number of an element?

    <p>The number of protons in an atom</p> Signup and view all the answers

    Which model of atoms was used until the early 1900s?

    <p>The solid sphere model</p> Signup and view all the answers

    What did the solid sphere model of atoms fail to explain?

    <p>Chemical reactions</p> Signup and view all the answers

    What are the sub-atomic particles that make up an atom according to the new model?

    <p>Protons, neutrons, and electrons</p> Signup and view all the answers

    Where are protons and neutrons located within an atom?

    <p>In the nucleus</p> Signup and view all the answers

    Why are atoms electrically neutral?

    <p>Because they have an equal number of protons and electrons</p> Signup and view all the answers

    Which of the following correctly describes the composition of an atom's nucleus?

    <p>The nucleus is made up of protons and neutrons.</p> Signup and view all the answers

    What is the overall electric charge of an atom?

    <p>Neutral</p> Signup and view all the answers

    Which of the following statements about the mass of an atom is true?

    <p>The mass of an atom is concentrated in its nucleus.</p> Signup and view all the answers

    What is the atomic number of an arsenic atom?

    <p>33</p> Signup and view all the answers

    What did the early 1900s model of atoms fail to explain?

    <p>Chemical reactions</p> Signup and view all the answers

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