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

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

<p>4 (D)</p> Signup and view all the answers

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

<p>Positive (C)</p> Signup and view all the answers

Which subatomic particle determines the identity of an element?

<p>Proton (C)</p> Signup and view all the answers

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

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

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