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Question

The charge of the atom containing 17 protons, 18 neutrons and 18 electrons is:
  1. -2
  2. -1
  3. zero
  4. 1


Solution

The correct option is B -1
In an atom total number of electrons and protons are equal. In this species there are 18 electrons and 17 protons , one electron is extra  and hence charge on species is -1

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