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Class 9 CBSE: Structure of an Atom Quiz
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Class 9 CBSE: Structure of an Atom Quiz

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Questions and Answers

What is the basic unit of an element?

  • Compound
  • Ion
  • Atom (correct)
  • Molecule

    • Which subatomic particle has a negative charge?

  • Nucleus
  • Proton
  • Neutron
  • Electron (correct)

    • What is the dense, positively charged center of an atom called?

  • Electron cloud
  • Proton
  • Nucleus (correct)
  • Neutron

    • Which scientist proposed the planetary model of the atom?

    <p>Niels Bohr</p> Signup and view all the answers

    What is the total number of subatomic particles in an atom?

    <p>4</p> Signup and view all the answers

    What is the charge of the subatomic particle found in the nucleus of an atom?

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

    Which subatomic particle determines the identity of an element?

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

    What is the approximate mass ratio of a proton to an electron?

    <p>$1836:1$</p> Signup and view all the answers

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