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    Chemistry
    Grade-9
    Easy

    Question

    How many neutrons are in this element?

    1. 79
    2. 197
    3. 118
    4. Cannot be determined

    Hint:

    Atomic mass = number of neutron + atomic number.

    The correct answer is: 118

      • Each element is represented in the form AXZ. A is atomic mass, Z is atomic number and X represents the element.
      • Here in 19779Au, 197 is atomic mass and 79 is atomic number.
      • Atomic mass = number of neutron + atomic number.
      therefore Number of neutron = 197-79 = 118.

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