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(b) An atom of an element is represented by the symbol 40 X 15 ) State
the mass number of the atom
(id) What is the atomic number of the atom?
(ui) How many neutrons are present in the atom?​

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Answer:

  1. mass number = 40
  2. atomic number = 15
  3. no.of neutron = 40-15 = 25
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