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Class IX Science: Structure of Atom Notes
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Class IX Science: Structure of Atom Notes

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Questions and Answers

What is the maximum number of electrons that can be present in the outermost orbit?

  • 8 (correct)
  • 2
  • 6
  • 10

    • What is valency?

  • The combining capacity of the atoms of an element (correct)
  • The number of neutrons in an atom
  • The number of electrons in an atom
  • The number of protons in an atom

    • What is the valency of elements having 5 electrons in the valence shell?

  • 2
  • 3 (correct)
  • 1
  • 5

    • What is the sum of protons and neutrons present in an atom known as?

    <p>Mass number</p> Signup and view all the answers

    What are isotopes?

    <p>Atoms with different mass numbers but same atomic numbers</p> Signup and view all the answers

    If an element has 3 electrons in its valence shell, what is its valency?

    <p>3</p> Signup and view all the answers

    What is the maximum number of electrons that can be present in the second shell of an atom?

    <p>8</p> Signup and view all the answers

    How many protons are present in an atom with atomic number 20?

    <p>20</p> Signup and view all the answers

    If an isotope of carbon has a mass number of 14, how many neutrons does it have?

    <p>6</p> Signup and view all the answers

    What is the valency of an element with 6 electrons in its valence shell?

    <p>-2</p> Signup and view all the answers

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