CBSE  /  Class 9  /  Science  /  Structure of the Atom

  • 1. 
    The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

  • 13
  • 10
  • 14
  • 16

  • 2. 
    An alpha particle is also known as:

  • subatomic particle
  • an unionised helium atom
  • a neutral particle
  • a doubly-charged helium ion

  • 3. 
    There are three isotopes of carbon which are named as C-12, C-13 and C-14 out of which C-12 is the most abundant isotope. In the given structures of 3 isotopes, what will be the composition of the nucleus?

  • C-12 : 6p + 6n, C-13 : 7p + 6n, C-14 : 8p + 6n
  • C-12 : 6p + 6n, C-13 : 6p + 7n, C-14 : 6p + 8n
  • C-12 : 6p + 6n, C-13 : 5p + 8n, C-14 : 7p + 7n
  • C-12 : 6p + 6n, C-13 : 12p + 1n, C-14 : 5p + 9n

  • 4. 
    The charge on an electron is equal to:

  • 1. 6 × 10C of -ve charge
  • 2. 6 × 10C of -ve charge
  • 1. 6 × 10C of -ve charge
  • 1. 6 × 10C of -ve charge

  • 5. 
    Which of the following isotope is used in the treatment of blood cancer?

  • P-32
  • I-131
  • Co-60
  • any of these

  • 6. 
    Isobars do not differ in the number of

  • protons
  • electrons
  • neutrons
  • nucleons
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